EP3571259A1

EP3571259A1 - Composition comprising 2,3,3,3-tetrafluoropropene

Info

Publication number: EP3571259A1
Application number: EP18703066.3A
Authority: EP
Inventors: Wissam Rached
Original assignee: Arkema France SA
Current assignee: Arkema France SA
Priority date: 2017-01-19
Filing date: 2018-01-18
Publication date: 2019-11-27
Also published as: FR3061906B1; WO2018134528A1; JP2020514481A; FR3061906A1; CN110234727A; US20190367789A1

Abstract

The invention relates to a composition comprising between 74 wt.% and 80 wt.% of 2,3,3,3-tetrafluoropropene, between 19 wt.% and 25 wt.% of difluoromethane, and between 1 and 1.9 wt.% of propane, in relation to the total weight of the composition. The invention also relates to various uses of said composition, particularly in the field of refrigeration, air-conditioning or heat pumps.

Description

COMPOSITION COMPRISING 2,3,3,3-TETRAFLUOROPROPENE

FIELD OF THE INVENTION The present invention relates to a composition comprising 2,3,3,3-tetrafluoropropene, and their uses as a heat transfer fluid, especially in refrigeration, air conditioning and heat pump.

Fluids based on fluorocarbon compounds are widely used in many industrial devices, including air conditioning, heat pump or refrigeration. These devices have in common to rely on a thermodynamic cycle comprising the vaporization of the fluid at low pressure (in which the fluid absorbs heat); compressing the vaporized fluid to a high pressure; condensing the vaporized fluid into a high pressure liquid (in which the fluid emits heat); and the expansion of the fluid to complete the cycle.

The choice of a heat transfer fluid (which may be a pure compound or a mixture of compounds) is dictated on the one hand by the thermodynamic properties of the fluid, and on the other hand by additional constraints.

In particular, depending on the flammability of the fluid, more or less restrictive safety measures must be taken for the use of this fluid in certain applications, or the use of this fluid may even be proscribed in other applications.

Another important criterion is that of the impact of the fluid considered on the environment. For example, chlorinated compounds (chlorofluorocarbons and hydrochlorofluorocarbons) have the disadvantage of damaging the ozone layer. Henceforth, non-chlorinated compounds such as hydrofluorocarbons, fluoroethers and more recently fluoroolefins (or fluoroalkenes) are generally preferred. Fluorolefins also generally have a short life time, and therefore a lower global warming potential (GWP) than other compounds.

In this regard, the documents WO 2004/037913 and WO 2005/105947 teach the use of compositions comprising at least one fluoroalkene having three or four carbon atoms, in particular pentafluoropropene and tetrafluoropropene, as heat transfer fluids. WO 2007/053697 and WO 2007/126414 disclose mixtures of fluoroolefins and other heat transfer compounds as heat transfer fluids.

However, olefinic compounds tend to be more flammable than saturated compounds.

There is therefore a real need to obtain and use less flammable heat transfer fluids than those of the state of the art, while having a low GWP, preferably less than 150. DESCRIPTION OF THE INVENTION

The present invention relates to a composition comprising (preferably constituted) from 74% to 80% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), from 19% to 25% by weight of difluoromethane (HFC -32), and 1 to 1, 9% by weight of propane (preferably 1 to 1, 8% by weight of propane), relative to the total weight of the composition.

Preferably, the composition according to the invention is such that the total sum of the weight contents of 2,3,3,3-tetrafluoropropene (HFO-1234yf), difluoromethane (HFC-32) and propane is equal to 100%.

Preferably, the weight content of propane in the composition is, for example, between 1.1% and 1.9%, 1.2% and 1.9%, 1.3% and 1.9%, or 1.4%. and 1.9%, 1.5% and 1.9%, 1.6% and 1.9%, 1.7% and 1.9%, 1.8% and 1.9%, 1.1%. and 1, 8%, 1, 1% and 1, 7%, 1, 1% and 1, 6%, 1, 1% and 1, 5%, 1, 1% and 1, 4%, 1, 1% and 1, 3%, 1, 1% and 1, 2%, 1, 2% and 1, 8%, 1, 2% and 1, 7%, 1, 2% and 1, 6%, 1, 2%. and 1.5%, 1, 2% and 1.4%, 1, 2% and 1.3%, 1.3% and 1.8%, 1.3% and 1.7%, 1.3%. and 1.6%, 1.3% and 1.5%, 1.3% and 1.4%, 1.4% and 1.8%, 1.4% and 1.7%, 1.4%. and 1.6%, 1.4% and 1.5%, 1.5% and 1.8%, 1.5% and 1.7%, 1.5% and 1.6%, 1.6% and and 1, 8%, 1, 6%, and 1.7%, or between 1.7% and 1.8%. Preferably, the weight content of propane in the composition is 1, 7% or 1, 8%.

Preferably, the weight content of 2,3,3,3-tetrafluoropropene in the composition according to the invention is, for example, between 74% and 79%, 74% and 78%, 74.1% and 78%, 74%. 2% and 78%, 74.3% and 80%, 74.5% and 78%, 74.6% and 78%, 74.7% and 78%, 74.8% and 78%, 74.9% and 78%, 75% and 78%, 75.1% and 78%, 75.2% and 78%, 75.3% and 78%, 75.4% and 78%, 75.5% and 78%, 75.6% and 78%, 75.7% and 78%, 75.8% and 78%, 75.9% and 78%, 76% and 78%, 74% and 77.5%, 74% and 77%. %, 74% and 76.9%, 74% and 76.8%, 74 and 76.7%, 74% and 76.6%, 74% and 76.5%, 74% and 76.4%, 74% % and 76.3%, 74% and 76.2%, 74% and 76.1%, 74% and 76%, 74.5% and 77.5%, 74.5% and 77%, 75% and 77.5%, or between 75% and 77%. Preferably, the weight content of 2,3,3,3-tetrafluoropropene in the composition according to the invention is between 76% and 78%.

Preferably, the weight content of difluoromethane in the composition according to the invention is, for example, between 19% and 24%, 19.5% and 24%, 20% and 24%, 20.5% and 24%, 21%. and 24%, 21, 5% and 24%, 19% and 23.5%, 19.5% and 23.5%, 20% and 23.5%, 20.5% and 23.5%, 21% and 23.5%, 21.5% and 23.5%, 19% and 23%, 19.5% and 23%, 20% and 23%, 20.5% and 23%, 21% and 23%, 21, 5% and 23%, 19% and 22.5%, 19.5% and 22.5%, 20% and 22.5%, 20.5% and 22.5%, 21% and 22.5% %, 21, 5% and 22.5%, 19% and 22%, 19.5% and 22%, 20% and 22%, 20.5% and 22%, 21% and 22%, or between 21, 5% and 22%.

According to one embodiment, the composition according to the invention comprises (preferably consists of) from 74.1% to 79.1% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), of 19% 24% by weight of difluoromethane (HFC-32), and 1 to 1, 9% by weight of propane (preferably 1 to 1, 8% by weight of propane), relative to the total weight of the composition.

According to one embodiment, the composition according to the invention comprises (preferably consists of) from 74% to 80% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), from 19% to 25% by weight. weight of difluoromethane (HFC-32), and propane in one of the following contents: 1%, 1, 1%, 1, 2%, 1, 3%, 1, 4%, 1, 5%, 1, 6%, 1, 7%, 1, 8% or 1, 9% relative to the total weight of the composition.

According to one embodiment, the composition according to the invention comprises (preferably consists of) from 74.1% to 79.1% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), of 19% 24% by weight of difluoromethane (HFC-32), and propane in one of the following contents: 1%, 1, 1%, 1, 2%, 1, 3%, 1, 4%, 1, 5 %, 1, 6%, 1, 7%, 1, 8% or 1, 9% relative to the total weight of the composition.

According to one embodiment, the composition according to the invention comprises (preferably consists of) 76% to 79% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), from 20% to 23% by weight. weight of difluoromethane (HFC-32), and from 1% to 1.9% by weight of propane (preferably from 1 to 1.8% by weight of propane), relative to the total weight of the composition.

According to one embodiment, the composition according to the invention comprises (preferably consists of) of 76.5% to 78.5% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), of 20% to 22% by weight of difluoromethane (HFC-32), and from 1% to 1.9% by weight of propane (preferably from 1 to 1.8% by weight of propane), relative to the total weight of the composition . According to one embodiment, the composition according to the invention comprises (preferably consists of) 76% to 79% by weight of 2,3,3,3-tetrafluoropropene (HFO-1234yf), from 20% to 23% by weight. weight of difluoromethane (HFC-32), and propane in one of the following contents: 1%, 1, 1%, 1, 2%, 1, 3%, 1, 4%, 1, 5%, 1, 6%, 1, 7%, 1, 8% or 1, 9% relative to the total weight of the composition.

A preferred composition according to the invention is as follows: 76.7% (± 0.5%) by weight of 2,3,3,3-tetrafluoropropene, 21.5% (± 0.5%) by weight of difluoromethane , and 1, 8% (± 0.1%) by weight of propane, relative to the total weight of the composition.

A preferred composition according to the invention is as follows: 76.7% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.8% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is as follows: 76.6% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.9% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is the following: 77.3% (± 0.5%) by weight of 2,3,3,3-tetrafluoropropene, 21.5% (± 0.5%) by weight of difluoromethane , and 1, 2% (± 0.2%) by weight of propane, relative to the total weight of the composition.

A preferred composition according to the invention is as follows: 77.5 by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.0% by weight of propane, relative to the weight total of the composition.

A preferred composition according to the invention is as follows: 77.3% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.2% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is as follows: 77.1% by weight of 2,3,3,3-tetrafluoropropene, 21,5% by weight of difluoromethane, and 1,4% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is as follows: 77.6% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.4% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is as follows: 77.0% (± 0.5%) by weight of 2,3,3,3-tetrafluoropropene, 21.5% (± 0.5%) by weight of difluoromethane and 1.5% (± 0.4%) by weight of propane, based on the total weight of the composition.

A preferred composition according to the invention is as follows: 77.3% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.7% by weight of propane, relative to total weight of the composition. A preferred composition according to the invention is as follows: 76.8% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.7% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is as follows: 77.2% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.8% by weight of propane, relative to total weight of the composition.

A preferred composition according to the invention is the following: 77.1% by weight of

2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.9% by weight of propane, relative to the total weight of the composition.

The compositions according to the invention are advantageously little or non-flammable.

The compositions according to the invention advantageously have a flame propagation velocity of less than 10 cm / s, preferably less than or equal to 9.5 cm / s, preferably less than or equal to 9 cm / s, advantageously less than or equal to 8 , 5 cm / s, and in particular less than or equal to 8 cm / s.

The compositions according to the invention advantageously lead to a composition "WCFF" (after leakage) having a flame propagation speed of less than 10 cm / s, preferably less than or equal to 9.5 cm / s, preferentially less than or equal to 9 cm / s, advantageously less than or equal to 8.5 cm / s, and in particular less than or equal to 8 cm / s.

A composition called "WCF" ("worst case of formulation forflammability") is defined in ASHRAE 34-2013 as being a formulation composition with the highest flame spread rate. This composition is very close to the nominal composition with a certain tolerance.

A so-called WCFF (worst case of fractionation for flammability) composition is defined in ASHRAE 34-2013 as the composition with the highest flame spread rate. This composition is determined according to a well-defined method in the same standard. The compositions according to the invention advantageously have a good compromise between good energy performance, low or no flammability, and low GWP.

The compositions according to the invention advantageously have a GWP of less than 150, preferably less than 148.

Because of their low flammability, the compositions according to the invention are advantageously safer when they are used as heat transfer fluids in refrigeration, air conditioning and for heating. In the context of the present invention, the flammability and the flame propagation velocity are defined and determined according to the test in ASHRAE 34-2013, which refers to ASTM E 681 for the apparatus used.

The test method described in ASHRAE 34-2013 is the one developed in T. Jabbour's thesis, "Classification of flammability of refrigerants based on the fundamental speed of flame" under the direction of Denis

Clodic. Thesis, Paris, 2004.

The experimental device uses in particular the method of vertical glass tube (number of tube 2, length 150 cm, diameter 40 cm). The use of two tubes makes it possible to do two tests with the same concentration at the same time. The tubes are equipped with tungsten electrodes, which are placed at the bottom of each tube, 6.35mm (1/4 inch) apart and connected to a 15kV generator.

30mA.

The various compositions tested are described as flammable or non-flammable as such, according to the criteria defined in the ASHRAE 34- 2013 standard.

The composition according to the invention is advantageously classified 2L according to the ASHRAE 34-2013 standard. According to this standard, classification 2L requires a flame propagation speed of less than 10 cm / s.

The composition according to the invention may be prepared by any known method, such as for example by simple mixing of the various compounds with each other.

Heat transfer composition According to one embodiment, the composition according to the invention is a heat transfer fluid.

The present invention also relates to a heat transfer composition comprising (preferably consisting of) the composition according to the invention mentioned above, and at least one additive especially chosen from nanoparticles, stabilizers, surfactants, tracer agents and fluorescent agents. odorants, lubricants and solubilizing agents. Preferably, the additive is chosen from lubricants, and especially lubricants based on polyol esters.

The additives may especially be chosen from nanoparticles, stabilizers, surfactants, tracer agents, fluorescent agents, odorants, lubricants and solubilizing agents.

By "heat transfer compound", respectively "heat transfer fluid" or "refrigerant" means a compound, respectively a fluid, capable of absorbing heat by evaporating at low temperature and low pressure and to reject heat by condensing at high temperature and high pressure, in a vapor compression circuit. In general, a heat transfer fluid may comprise one, two, three or more than three heat transfer compounds.

By "heat transfer composition" is meant a composition comprising a heat transfer fluid and optionally one or more additives which are not heat transfer compounds for the intended application.

The stabilizer (s), when present, preferably represent at most 5% by weight in the heat transfer composition. Among the stabilizers, there may be mentioned in particular nitromethane, ascorbic acid, terephthalic acid, azoles such as tolutriazole or benzotriazole, phenol compounds such as tocopherol, hydroquinone, t-butyl hydroquinone, 2,6-di-tert-butyl-4-methylphenol, epoxides (optionally fluorinated or perfluorinated alkyl or alkenyl or aromatic) such as n-butyl glycidyl ether, hexanediol diglycidyl ether, allyl glycidyl ether, butylphenylglycidyl ether, phosphites, phosphonates, thiols and lactones.

As nanoparticles, it is possible to use, in particular, nanoparticles of carbon, metal oxides (copper, aluminum), ΤΊΟ2, Al2O3, M0S2, etc.

As tracer agents (which can be detected), mention may be made of deuterated or non-deuterated hydrofluorocarbons, deuterated hydrocarbons, perfluorocarbons, fluoroethers, brominated compounds, iodinated compounds, alcohols, aldehydes and ketones. nitrous oxide and the combinations of these this. The tracer agent is different from the one or more heat transfer compounds composing the heat transfer fluid.

As solubilizing agents, mention may be made of hydrocarbons, dimethyl ether, polyoxyalkylene ethers, amides, ketones, nitriles, chlorocarbons, esters, lactones, aryl ethers, fluoroethers and magnesium compounds. , 1 - trifluoroalkanes. The solubilizing agent is different from the one or more heat transfer compounds composing the heat transfer fluid.

As fluorescent agents, mention may be made of naphthalimides, perylenes, coumarins, anthracenes, phenanthracenes, xanthenes, thioxanthenes, naphthoxanhthenes, fluoresceins and derivatives and combinations thereof.

As odorants, mention may be made of alkyl acrylates, allyl acrylates, acrylic acids, acrylresters, alkyl ethers, alkyl esters, alkynes, aldehydes, thiols, thioethers, disulfides, allyl isothiocyanates and alkanoic acids. , amines, norbornenes, norbornene derivatives, cyclohexene, heterocyclic aromatic compounds, ascaridole, o-methoxy (methyl) phenol and combinations thereof.

In the context of the invention, the terms "lubricant", "lubricating oil" and "lubricating oil" are used equivalently.

Lubricants that may be used include oils of mineral origin, silicone oils, paraffins of natural origin, naphthenes, synthetic paraffins, alkylbenzenes, poly-alpha olefins, polyalkene glycols, polyol esters, (polyol ester) and / or polyvinyl ethers.

According to one embodiment, the lubricant is based on polyol esters. In particular, the lubricant comprises one or more polyol ester (s).

According to one embodiment, the polyol esters are obtained by reaction of at least one polyol, with a carboxylic acid or with a mixture of carboxylic acids.

In the context of the invention, the term "carboxylic acid" covers both a monocarboxylic and polycarboxylic acid, such as, for example, dicarboxylic acid.

In the context of the invention, and unless otherwise indicated, the term "polyol" means a compound containing at least two hydroxyl groups (-OH).

Polyol esters A)

According to one embodiment, the polyol esters according to the invention have the following formula (I):

in which :

R ¹ is a linear or branched hydrocarbon radical, optionally substituted with at least one hydroxyl group and / or comprising at least one heteroatom selected from the group consisting of -O-, -N-, and -S-;

each R ² is, independently of one another, selected from the group consisting of:

o i) H;

ii) an aliphatic hydrocarbon radical;

iii) a branched hydrocarbon radical;

iv) a mixture of a radical ii) and / or iii), with an aliphatic hydrocarbon radical comprising from 8 to 14 carbon atoms; and n is an integer of at least 2. Within the scope of the invention, the term "hydrocarbon radical" means a radical composed of carbon atoms and hydrogen.

According to one embodiment, the polyols have the following general formula (II):

R ¹ (OH) _n (II)

in which :

R ¹ is a linear or branched hydrocarbon radical, optionally substituted with at least one hydroxyl group, preferably with two hydroxyl groups, and / or comprising at least one heteroatom selected from the group consisting of -O-, -N-, and -S-; and

n is an integer of at least 2.

Preferably, R ¹ is a linear or branched hydrocarbon radical comprising from 4 to 40 carbon atoms, preferably from 4 to 20 carbon atoms.

Preferably, R ¹ is a hydrocarbon radical, linear or branched, comprising at least one oxygen atom.

Preferably, R ¹ is a branched hydrocarbon radical comprising from 4 to 10 carbon atoms, preferably 5 carbon atoms, substituted by two hydroxyl groups.

According to a preferred embodiment, the polyols comprise from 2 to 10 hydroxyl groups, preferably from 2 to 6 hydroxyl groups.

The polyols according to the invention may comprise one or more oxyalkylene groups, it being in this particular case polyether polyols. The polyols according to the invention may also comprise one or more nitrogen atoms. For example, the polyols may be alkanol amines containing from 3 to 6 OH groups. Preferably, the polyols are alkanolamines containing at least two OH groups, and preferably at least three.

According to the present invention, the preferred polyols are selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, glycerol, neopentyl glycol, 1,2-butanediol, 1,4-butanediol, 1,3-butanediol, pentaerythritol, dipentaerythritol, tripentaerythritol, triglycerol, trimethylolpropane, sorbitol, hexaglycerol, and mixtures thereof. Preferably, the polyol is pentaerythritol or dipentaerythritol.

According to the invention, the carboxylic acids can satisfy the following general formula (III):

R ² COOH (III)

in which :

R ² is selected from the group consisting of:

o i) H;

ii) an aliphatic hydrocarbon radical;

iii) a branched hydrocarbon radical;

iv) a mixture of a radical ii) and / or iii), with an aliphatic hydrocarbon radical containing from 8 to 14 carbon atoms.

Preferably, R ² is an aliphatic hydrocarbon radical comprising from 1 to 10, preferably from 1 to 7 carbon atoms, and in particular from 1 to 6 carbon atoms.

Preferably, R ² is a branched hydrocarbon radical comprising from 4 to 20 carbon atoms, in particular from 5 to 14 carbon atoms, and preferably from 6 to 8 carbon atoms.

According to a preferred embodiment, a branched hydrocarbon radical has the following formula (IV):

-C (R ³ ) R ⁴ ) (R ⁵ ) (IV) wherein R ³ , R ⁴ and R ⁵ are, independently of one another, an alkyl group, and at least one of the alkyl groups contains at least two atoms of carbon. Such branched alkyl groups, once bound to the carboxyl group, are known as the "neo group", and the corresponding acid as "neo acid". Of preferably, R ³ and R ⁴ are methyl groups and R ¹⁰ is an alkyl group comprising at least two carbon atoms.

According to the invention, the radical R ² can comprise one or more carboxyl groups, or ester groups such as -COOR ⁶ , with R ⁶ representing an alkyl radical, hydroxyalkyl radical or a hydroxyalkyloxy alkyl group.

Preferably, the R ² COOH acid of formula (III) is a monocarboxylic acid. Examples of carboxylic acids in which the hydrocarbon radical is aliphatic include: formic acid, acetic acid, propionic acid, butyric acid, pentanoic acid, hexanoic acid and heptanoic acid .

Examples of carboxylic acids in which the hydrocarbon radical is branched include: 2-ethyl-n-butyric acid, 2-hexyldecanoic acid, isostearic acid, 2-methyl-hexanoic acid, 2-methylbutanoic acid, 3-methylbutanoic acid, 3,5,5-trimethylhexanoic acid, 2-ethylhexanoic acid, neoheptanoic acid, and neodecanoic acid.

The third type of carboxylic acids which can be used in the preparation of the polyol esters of formula (I) are carboxylic acids comprising an aliphatic hydrocarbon radical containing from 8 to 14 carbon atoms. For example: decanoic acid, dodecanoic acid, lauric acid, stearic acid, myristic acid, behenic acid, etc. Among the dicarboxylic acids, mention may be made of maleic acid. , succinic acid, adipic acid, sebacic acid ...

According to a preferred embodiment, the carboxylic acids used to prepare the polyol esters of formula (I) comprise a mixture of monocarboxylic and dicarboxylic acids, the proportion of monocarboxylic acids being the majority. The presence of dicarboxylic acids results in particular in the formation of polyol esters of high viscosity.

In particular, the formation reaction of the polyol esters of formula (I) by reaction between the carboxylic acid and the polyols is an acid catalyzed reaction. This is especially a reversible reaction, which can be complete by using a large amount of acid or by removing the water formed during the reaction.

The esterification reaction can be carried out in the presence of organic or inorganic acids, such as sulfuric acid, phosphoric acid ...

Preferably, the reaction is carried out in the absence of catalyst.

The amount of carboxylic acid and polyol may vary in the mixture depending on the desired results. In the particular case where all the hydroxyl groups are esterified, a sufficient amount of carboxylic acid must be added to react with all the hydroxyls.

According to one embodiment, when using mixtures of carboxylic acids, these can react sequentially with the polyols.

According to a preferred embodiment, when using a mixture of carboxylic acids, a polyol reacts first with a carboxylic acid, typically the highest molecular weight carboxylic acid, followed by reaction with the acid. carboxylic acid having an aliphatic hydrocarbon chain.

According to one embodiment, the esters can be formed by reaction between the carboxylic acids (or their anhydride or ester derivatives) with the polyols in the presence of acids at elevated temperature, while removing the water formed during the reaction. . Typically, the reaction can be carried out at a temperature of 75 to 200 ° C.

According to another embodiment, the polyol esters formed may comprise hydroxyl groups which are not all reactive, in this case they are esters of partially esterified polyols.

According to a preferred embodiment, the polyol esters are obtained from pentaerythritol alcohol, and from a mixture of carboxylic acids: isononanoic acid, at least one acid having an aliphatic hydrocarbon radical comprising from 8 to 10 carbon atoms, and heptanoic acid. The preferred polyol esters are obtained from pentaerythritol, and a mixture of 70% of isononanoic acid, 15% of at least one carboxylic acid having an aliphatic hydrocarbon radical comprising from 8 to 10 carbon atoms, and 15% heptanoic acid. For example, Solest 68 oil sold by CPI Engineering Services Inc.

According to a preferred embodiment, the polyol esters are obtained from dipentaerythritol alcohol, and from a mixture of carboxylic acids: isononanoic acid, at least one acid having an aliphatic hydrocarbon radical comprising from 8 to 10 carbon atoms, and heptanoic acid

Preferably, the polyol esters of the invention have one of the following formulas (1A) or (1B):

in which each R represents, independently of one another:

an aliphatic hydrocarbon radical comprising from 1 to 10, preferably from 2 to 9, preferentially from 4 to 9 carbon atoms, and in particular from 1 to 6 carbon atoms.

a branched hydrocarbon radical comprising from 4 to 20 carbon atoms, in particular from 4 to 14 carbon atoms, and preferably from 4 to 9 carbon atoms.

In particular, the polyol esters of formula (I-A) or of formula (I-B) comprise different radicals R.

A preferred polyol ester is an ester of formula (I-A) wherein R is selected from:

an aliphatic hydrocarbon radical comprising 4 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 6 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 7 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 8 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 9 carbon atoms; and / or a branched hydrocarbon radical comprising 4 carbon atoms; and / or a branched hydrocarbon radical comprising 5 carbon atoms; and / or a branched hydrocarbon radical comprising 7 carbon atoms; and or a branched hydrocarbon radical comprising 8 carbon atoms

a branched hydrocarbon radical comprising 9 carbon atoms.

A preferred polyol ester is an ester of formula (1-B) in which R is chosen an aliphatic hydrocarbon radical comprising 4 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 6 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 7 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 8 carbon atoms; and / or an aliphatic hydrocarbon radical comprising 9 carbon atoms; and / or a branched hydrocarbon radical comprising 4 carbon atoms; and / or a branched hydrocarbon radical comprising 5 carbon atoms; and / or a branched hydrocarbon radical comprising 7 carbon atoms; and / or a branched hydrocarbon radical comprising 8 carbon atoms; and / or a branched hydrocarbon radical comprising 9 carbon atoms.

Polyol esters B)

According to another embodiment, the polyol esters of the invention comprise at least one ester of one or more branched carboxylic acids comprising at most 8 carbon atoms. The ester is especially obtained by reacting said branched carboxylic acid with one or more polyols.

Preferably, the branched carboxylic acid comprises at least 5 carbon atoms. In particular, the branched carboxylic acid comprises from 5 to 8 carbon atoms, and preferably it contains 5 carbon atoms.

Preferably, the above-mentioned branched carboxylic acid does not comprise 9 carbon atoms. In particular, said carboxylic acid is not 3,5,5-trimethylhexanoic acid.

According to a preferred embodiment, the branched carboxylic acid is selected from 2-methylbutanoic acid, 3-methylbutanoic acid, and mixtures thereof.

In a preferred embodiment, the polyol is selected from the group consisting of neopentyl glycol, glycerol, trimethylol propane, pentaerythritol, dipentaerythritol, tri pentaerythritol, and mixtures thereof.

According to a preferred embodiment, the polyol esters are obtained from: i) a carboxylic acid selected from 2-methylbutanoic acid, 3-methylbutanoic acid, and mixtures thereof; and

ii) a polyol selected from the group consisting of neopentyl glycol, glycerol, trimethylol propane, pentaerythritol, dipentaerythritol, tripentaerythritol, and mixtures thereof.

Preferably, the polyol ester is that obtained from 2-methylbutanoic acid and pentaerythritol.

Preferably, the polyol ester is that obtained from 2-methylbutanoic acid and dipentaerythritol.

Preferably, the polyol ester is that obtained from 3-methylbutanoic acid and pentaerythritol.

Preferably, the polyol ester is that obtained from 3-methylbutanoic acid and dipentaerythritol.

Preferably, the polyol ester is that obtained from 2-methylbutanoic acid and neopentyl glycol.

Polyol esters C)

According to another embodiment, the polyol esters according to the invention are poly (neopentylpolyol) esters obtained by:

i) reaction of a neopentylpolyol having the following formula (V):

in which :

each R is, independently of one another, CH3, C2H5 or p is an integer from 1 to 4; with at least one monocarboxylic acid having 2 to 15 carbon atoms, and in the presence of an acid catalyst, the molar ratio between the carboxyl groups and the hydroxyl groups being less than 1: 1, to form a composition of poly (neopentyl partially esterified polyol; and ii) reacting the partially esterified poly (neopentyl) polyol composition obtained after step i) with another carboxylic acid having from 2 to 15 carbon atoms, to form the final ester composition (s); ) of poly (neopentyl polyol).

Preferably, the reaction i) is carried out with a molar ratio ranging from 1: 4 to 1: 2. Preferably, the neopentyl polyol has the following formula (VI):

in, we

R-G R

(VI)

wherein each R is, independently of one another, Ch, C2H5 or

Preferred neopentyl polyols are those selected from pentaerythritol, dipentaerythritol, tripentaerythritol, tetraerythritol, trimethylolpropane, trimethylolethane, and neopentyl glycole. In particular, the neopentyl polyol is pentaerythritol.

Preferably, a single neopentyl polyol is used to produce the POE-based lubricant. In some cases, two or more neopentyl polyols are used. This is particularly the case when a commercial product of pentaerythritol includes small amounts of dipentaerythritol, tripentaerythritol, and tetraerythritol.

According to a preferred embodiment, the abovementioned monocarboxylic acid comprises from 5 to 11 carbon atoms, preferably from 6 to 10 carbon atoms.

The monocarboxylic acids have in particular the following general formula (VII):

R'C (O) OH (VII)

in which R 'is a linear or branched C 1 -C 12 alkyl radical, a C 6 -C 12 aryl radical or a C 6 -C 30 aralkyl radical. Preferably, R 'is a C4-C10 alkyl radical, and preferentially a C5-C9 alkyl radical.

In particular, the monocarboxylic acid is selected from the group consisting of butanoic acid, pentanoic acid, hexanoic acid, heptanoic acid, n-octanoic acid, n nonanoic acid, n-decanoic acid, 3-methylbutanoic acid, 2-methylbutanoic acid, 2,4- dimethylpentanoic acid, 2-ethylhexanoic acid, 3,3,5-trimethylhexanoic acid, benzoic acid, and mixtures thereof.

According to a preferred embodiment, the monocarboxylic acid is n-heptanoic acid, or a mixture of n-heptanoic acid with another linear monocarboxylic acid, in particular n-octanoic acid and / or n-octanoic acid. - decanoic. Such a mixture of monocarboxylic acid may comprise between 15 and 100 mol% of heptanoic acid and between 85 and 0 mol% of other monocarboxylic acid (s). In particular, the mixture comprises between 75 and 100 mol% of heptanoic acid, and between 25 and 0 mol% of a mixture of octanoic acid and decanoic acid in a molar ratio of 3: 2.

According to a preferred embodiment, the polyol esters comprise:

i) from 45% to 55% by weight of a monopentaerythritol ester with at least one monocarboxylic acid having from 2 to 15 carbon atoms;

ii) less than 13% by weight of a dipentaerythritol ester with at least one monocarboxylic acid having 2 to 15 carbon atoms;

iii) less than 10% by weight of a tripentaerythritol ester with at least one monocarboxylic acid having from 2 to 15 carbon atoms; and iv) at least 25% by weight of a tetraerythritol ester and other pentaerythritol oligomers, with at least one monocarboxylic acid having 2 to 15 carbon atoms.

Polyol esters D)

According to another embodiment, the polyol esters according to the invention have the following formula (VIII):

(VIII) in which :

R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ and R ¹² are, independently of one another, H or CH 3; a, b, c, y, x and z are, independently of one another, an integer;

a + x, b + y, and c + z are, independently of one another, integers ranging from 1 to 20;

R ¹³ , R ¹⁴ and R ¹⁵ are, independently of one another, selected from the group consisting of aliphatic or branched alkyls, alkenyls, cycloalkyls, aryls, alkylaryls, arylalkyls, alkylcycloalkyls, cycloalkylalkyls, arylcycloalkyls; cycloalkylaryls, alkylcycloalkylaryls, alkylarylcycloalkyls, arylcycloalkylalkyls, arylalkylcycloalkyls, cycloalkylalkylaryls and cycloalkylarylalkyls, R ¹³ , R ¹⁴ and R ¹⁵ , having from 1 to 17 carbon atoms, and which may be optionally substituted.

According to a preferred embodiment, each of R ¹³ , R ¹⁴ and R ¹⁵ represents, independently of each other, a linear or branched alkyl group, an alkenyl group, a cycloalkyl group, said alkyl, alkenyl or cycloalkyl groups may comprise at least at least one heteroatom selected from N, O, Si, F or S. Preferably, each of R ¹³ , R ¹⁴ and R ¹⁵ has, independently of one another, from 3 to 8 carbon atoms, preferably from 5 to 7 carbon atoms. carbon atoms.

Preferably, a + x, b + y, and c + z are, independently of one another, integers ranging from 1 to 10, preferably from 2 to 8, and even more preferably from 2 to 4.

Preferably, R ⁷ , R ⁸ , R ⁹ , R ¹⁰ , R ¹¹ and R ¹² represent H.

The polyol esters of formula (VIII) above can typically be prepared as described in paragraphs [0027] to [0030] of international application WO2012 / 177742.

In particular, the polyol esters of formula (VIII) are obtained by esterification of glycerol alkoxylates (as described in paragraph [0027] of WO2012 / 177742) with one or more monocarboxylic acids having from 2 to 18 carbon atoms.

According to a preferred embodiment, the monocarboxylic acids have one of the following formulas:

R ¹³ COOH

R ¹⁴ COOH and

R ¹⁵ COOH in which R ¹³ , R ¹⁴ and R ¹⁵ are as defined above. Derivatives of the carboxylic acids can also be used, such as anhydrides, esters and acyl halides.

Esterification can be carried out with one or more monocarboxylic acids. Preferred monocarboxylic acids are those selected from the group consisting of acetic acid, propanoic acid, butyric acid, isobutanoic acid, pivalic acid, pentanoic acid, isopentanoic acid, hexanoic acid, heptanoic acid, octanoic acid, 2-ethylhexanoic acid, 3,3,5-trimethylhexanoic acid, nonanoic acid, decanoic acid, neodecanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, palmitoleic acid, citronellic acid, undecenoic acid, lauric acid, undecylenic acid, linolenic acid, arachidic acid, behenic acid, tetrahydrobenzoic acid, hydrogenated or non-hydrogenated abietic acid, 2-ethylhexanoic acid, furoic acid, benzoic acid, 4-acetylbenzoic acid, pyruvic acid ee, 4-tert-butyl-benzoic acid, naphthenic acid, 2-methyl benzoic acid, salicylic acid, their isomers, their methyl esters, and mixtures thereof.

Preferably, the esterification is carried out with one or more monocarboxylic acids selected from the group consisting of pentanoic acid, 2-methylbutanoic acid, n-hexanoic acid, n-heptanoic acid, 5-trimethylhexanoic acid, 2-ethylhexanoic acid, n-octanoic acid, n-nonanoic acid and isononanoic acid.

Preferably, the esterification is carried out with one or more monocarboxylic acids chosen from the group consisting of butyric acid, isobutyric acid, n-pentanoic acid, 2-methylbutanoic acid and 3-methylbutanoic acid. , n-hexanoic acid, n-heptanoic acid, n-octanoic acid, 2-ethylhexanoic acid, 3,3,5-trimethylhexanoic acid, n-nonanoic acid, decanoic acid, undecanoic acid, undecelenic acid, lauric acid, stearic acid, isostearic acid, and mixtures thereof.

According to another embodiment, the polyol esters according to the invention have the following formula (IX):

in which :

each of R ¹⁷ and R ¹⁸ is, independently of one another, H or CH 3;

each of m and n is, independently of one another, an integer, with m + n being an integer from 1 to 10;

R ¹⁶ and R ¹⁹ are, independently of one another, selected from the group consisting of aliphatic or branched alkyls, alkenyls, cycloalkyls, aryls, alkylaryls, arylalkyls, alkylcycloalkyls, cycloalkylalkyls, arylcycloalkyls; cycloalkylaryls, alkylcycloalkylaryls, alkylarylcycloalkyls, arylcycloalkylalkyls, arylalkylcycloalkyls, cycloalkylalkylaryls and cycloalkylarylalkyls,

R ¹⁶ and R ¹⁹ , having 1 to 17 carbon atoms, and may be optionally substituted.

According to a preferred embodiment, each of R ¹⁶ and R ¹⁹ represents, independently of one another, a linear or branched alkyl group, an alkenyl group or a cycloalkyl group, said alkyl, alkenyl or cycloalkyl groups possibly comprising at least one heteroatom chosen from N, O, Si, F or S. Preferably, each of R ¹⁶ and R ¹⁹ has, independently of one another, from 3 to 8 carbon atoms, preferably from 5 to 7 carbon atoms. carbon atoms.

According to a preferred embodiment, each of R ¹⁷ and R ¹⁸ represents H, and / or m + n is an integer ranging from 2 to 8, from 4 to 10, from 2 to 5, or from 3 to 5. In particular , m + n is 2, 3 or 4.

According to a preferred embodiment, the polyol esters of formula (IX) above are triethylene glycol diesters, tetraethylene glycol diesters, in particular with one or two monocarboxylic acids having from 4 to 9 carbon atoms.

The polyol esters of formula (IX) above may be prepared by esterifications of an ethylene glycol, a propylene glycol, or an oligo- or polyalkylene glycol, (which may be an oligo- or polyethylene glycol, oligo- or polypropylene glycol, or an ethylene glycol-propylene glycol block copolymer), with one or two monocarboxylic acids having 2 to 18 carbon atoms. Esterification can be performed identically to the esterification reaction used to prepare the polyol esters of formula (VIII) above.

In particular, monocarboxylic acids identical to those used to prepare the polyol esters of formula (VIII) above, can be used to form the polyol esters of formula (IX).

According to one embodiment, the lubricant based on polyol esters according to the invention comprises from 20 to 80%, preferably from 30 to 70%, and preferably from 40 to 60% by weight of at least one ester. polyol of formula (VIII), and from 80 to 20%, preferably from 70 to 30%, and preferably from 60 to 40% by weight of at least one polyol ester of formula (IX).

In general, certain alcohol functional groups may not be esterified during the esterification reaction, however, their proportion remains low. Thus, the POE can comprise between 0 and 5 mol% relative of CH ₂ OH units with respect to the -CH ₂ -O-C (= O) - units.

Preferred POE lubricants according to the invention are those having a viscosity of from 1 to 1000 centiStokes (cSt) at 40 ° C, preferably from 10 to 200 cSt, even more preferably from 20 to 100 cSt, and advantageously from 30 to 80 cSt. .

The international classification of oils is notably given by IS03448-1992 (NF T60-141) and according to which oils are designated by their average viscosity class measured at a temperature of 40 ° C.

uses

The composition according to the present invention is particularly suitable as heat transfer fluid in refrigeration, air conditioning and for heating.

The composition according to the present invention can be used in various applications for the replacement of current refrigerants such as R455A (mixture of R32 / R1234yf / C0 ₂ : 21, 5 / 75.5 / 3% by weight) or R454C ( mixture of R1234yf / R32: 78.5 / 21.5% by weight).

The present invention relates to the use of the composition according to the invention for reducing the risk of ignition and / or explosion in the event of refrigerant leakage.

The low flammability of the composition advantageously allows its use in larger quantities in heat transfer facilities. The use of refrigerants according to the flammability classes is described in the ISO 5149-1 standard (2014 version).

The present invention also relates to the use of a composition according to the invention or a heat transfer composition according to the invention, in a heat transfer system containing a vapor compression circuit.

According to one embodiment, the heat transfer system is:

- an air conditioning system or

- a refrigeration system; or

- a freezing system; or

a heat pump system.

The present invention also relates to a method of heat transfer based on the use of a heat transfer system containing a vapor compression circuit which comprises the composition according to the invention or the heat transfer composition according to the invention. . The heat transfer process may be a method of heating or cooling a fluid or a body.

The composition according to the invention or the heat transfer composition can also be used in a method of producing mechanical work or electricity, in particular in accordance with a Rankine cycle.

The invention also relates to a heat transfer installation comprising a vapor compression circuit containing the composition according to the invention or the heat transfer composition according to the invention.

According to one embodiment, this installation is selected from mobile or stationary refrigeration, heating (heat pump), air conditioning and freezing, and thermal engines.

This may include a heat pump installation, in which case the fluid or body that is heated (usually air and possibly one or more products, objects or organisms) is located in a room or a room. vehicle interior (for a mobile installation). According to a preferred embodiment, it is an air conditioning installation, in which case the fluid or body that is cooled (generally air and possibly one or more products, objects or organisms) is located in a local or vehicle interior (for a mobile installation). It can be a refrigeration plant or a freezing facility (or cryogenic installation), in which case the fluid or body that is cooled generally comprises air and one or more products, objects or organisms. , located in a room or container. The invention also relates to a method for heating or cooling a fluid or a body by means of a vapor compression circuit containing a heat transfer fluid or a heat transfer composition, said method successively comprising evaporation of the fluid or heat transfer composition, compression of the fluid or heat transfer composition, condensation of the fluid or heat transfer composition, and expansion of the fluid or heat transfer composition. heat transfer composition, wherein the heat transfer fluid is the composition according to the invention, or the heat transfer composition is as described above.

The invention also relates to a method for producing electricity by means of a heat engine, said method comprising successively the evaporation of the heat transfer fluid or a heat transfer composition, the expansion of the fluid or the heat transfer composition in a turbine for generating electricity, condensing the fluid or heat transfer composition and compressing the fluid or heat transfer composition, wherein the transfer fluid of heat is the composition according to the invention and the heat transfer composition is that described above.

The vapor compression circuit, containing a fluid or a heat transfer composition according to the invention, comprises at least one evaporator, a compressor preferably screw, a condenser and a pressure regulator, and lines for transporting the fluid or of the heat transfer composition between these elements. The evaporator and the condenser comprise a heat exchanger for heat exchange between the fluid or the heat transfer composition and another fluid or body.

The evaporator used in the context of the invention may be an overheating evaporator or an embedded evaporator. In an overheated evaporator, all of the aforementioned fluid or heat transfer composition is evaporated at the evaporator outlet, and the vapor phase is superheated.

In a flooded evaporator, the fluid / heat transfer composition in liquid form does not evaporate completely. A flooded evaporator has a liquid phase and vapor phase separator.

As a compressor, it is possible to use in particular a centrifugal compressor with one or more stages or a mini centrifugal compressor. Rotary, piston or screw compressors can also be used. According to one embodiment, the vapor compression circuit comprises a centrifugal compressor, and preferably a centrifugal compressor and a flooded evaporator.

According to another embodiment, the vapor compression circuit comprises a screw compressor, preferably twin-screw or single-screw. In particular, the vapor compression circuit comprises a twin-screw compressor, which can implement a substantial flow of oil, for example up to 6.3 Us.

A centrifugal compressor is characterized in that it uses rotating elements to radially accelerate the fluid or the heat transfer composition; it typically comprises at least one rotor and a diffuser housed in an enclosure. The heat transfer fluid or heat transfer composition is introduced into the center of the rotor and flows towards the periphery of the rotor while undergoing acceleration. Thus, on the one hand the static pressure increases in the rotor, and especially on the other hand at the level of the diffuser, the speed is converted into an increase of the static pressure. Each rotor / diffuser assembly constitutes a compressor stage. The centrifugal compressors may comprise from 1 to 12 stages, depending on the desired final pressure and the volume of fluid to be treated.

The compression ratio is defined as the ratio of the absolute pressure of the fluid / output heat transfer composition to the absolute pressure of said fluid or composition at the inlet.

The rotational speed for large centrifugal compressors ranges from 3000 to 7000 revolutions per minute. Small centrifugal compressors (or centrifugal mini-compressors) generally operate at a rotation speed that ranges from 40000 to 7000 revolutions per minute and comprise a small rotor (generally less than 0.15 m).

A multi-stage rotor can be used to improve the efficiency of the compressor and to limit the energy cost (compared to a single-stage rotor). For a two-stage system, the output of the first stage of the rotor feeds the input of the second rotor. Both rotors can be mounted on a single axis. Each stage can provide a fluid compression ratio of about 4 to 1, i.e. the output absolute pressure can be about four times the absolute suction pressure. Examples of two-stage centrifugal compressors, particularly for automotive applications, are described in US 5,065,990 and US 5,363,674.

The centrifugal compressor can be driven by an electric motor or by a gas turbine (for example powered by the exhaust gas of a vehicle, for mobile applications) or by gearing. The installation may include a coupling of the expander with a turbine to generate electricity (Rankine cycle).

The installation may also optionally comprise at least one heat transfer fluid circuit used for transmitting the heat (with or without a change of state) between the circuit of the heat transfer fluid or the heat transfer composition, and the fluid or body to be heated or cooled.

The installation may also optionally include two or more vapor compression circuits containing identical or different heat transfer fluids / compositions. For example, the vapor compression circuits may be coupled together.

The vapor compression circuit operates in a conventional vapor compression cycle. The cycle comprises changing the state of the fluid / heat transfer composition from a liquid phase (or diphasic liquid / vapor) to a vapor phase at a relatively low pressure, and then compressing the fluid / composition vapor phase to a relatively high pressure, the change of state (condensation) of the fluid / heat transfer composition from the vapor phase to the liquid phase at a relatively high pressure, and the reduction of the pressure to start again the cycle.

In the case of a cooling process, heat from the fluid or the body that is cooled (directly or indirectly via a heat transfer fluid) is absorbed by the fluid / heat transfer composition, during the cooling. evaporation of the latter, and this at a relatively low temperature compared to the environment. Cooling processes include air conditioning processes (with mobile installations, for example in vehicles, or stationary), refrigeration and freezing or cryogenics. In the field of air conditioning, there may be mentioned domestic air conditioning, commercial or industrial, where the equipment used are either chillers or direct expansion equipment. In the field of refrigeration, we can cite domestic refrigeration, commercial, cold rooms, the food industry, refrigerated transport (trucks, boats).

In the case of a heating process, heat is transferred (directly or indirectly, via a heat transfer fluid) from the fluid / heat transfer composition, during the condensation thereof / it, to fluid or body that is heated, and at a relatively high temperature relative to the environment. The installation allowing to implement the heat transfer is called in this "heat pump" case. These can include medium and high temperature heat pumps.

It is possible to use any type of heat exchanger for the implementation of the compositions according to the invention or heat transfer composition according to the invention, and in particular co-current heat exchangers or, preferably, countercurrent heat exchangers.

However, according to a preferred embodiment, the invention provides that the cooling and heating processes, and the corresponding facilities, comprise a countercurrent heat exchanger, either the condenser or the evaporator. Indeed, the compositions according to the invention or heat transfer composition defined above are particularly effective with countercurrent heat exchangers. Preferably, both the evaporator and the condenser comprise a countercurrent heat exchanger.

According to the invention, the term "countercurrent heat exchanger" is understood to mean a heat exchanger in which heat is exchanged between a first fluid and a second fluid, the first fluid at the inlet of the exchanger exchanging heat with the second fluid at the outlet of the exchanger, and the first fluid at the outlet of the exchanger exchanging heat with the second fluid at the inlet of the exchanger.

For example, countercurrent heat exchangers include devices in which the flow of the first fluid and the flow of the second fluid are in opposite or almost opposite directions. The exchangers operating in cross current mode with countercurrent tendency are also included among the countercurrent heat exchangers within the meaning of the present application.

In "low temperature refrigeration" processes, the inlet temperature of the composition according to the invention or heat transfer composition, to the evaporator is preferably from -45 ° C. to -15 ° C., especially from -40 ° C to -20 ° C, more preferably -35 ° C to -25 ° C and for example about -30 ° C or -20 ° C; and the temperature of the beginning of the condensation of the composition according to the invention or heat transfer compositions, the condenser is preferably from 25 ° C to 80 ° C, in particular from 30 ° C to 60 ° C, more particularly preferred from 35 ° C to 55 ° C and for example about 40 ° C.

In "moderate temperature cooling" processes, the inlet temperature of the composition according to the invention or heat transfer composition, to the evaporator is preferably from -20 ° C. to 10 ° C., especially from 15 ° C to 5 ° C, more preferably from -10 ° C to 0 ° C and for example about 5 ° C; and the temperature of the beginning of the condensation of the composition according to the invention or heat transfer composition, the condenser is preferably 25 ° C to 80 ° C, especially 30 ° C to 60 ° C, more particularly preferred from 35 ° C to 55 ° C and for example about 50 ° C. These processes can be refrigeration or air conditioning processes.

In "moderate temperature heating" processes, the inlet temperature of the composition according to the invention or heat transfer composition, at the evaporator is preferably from -20 ° C. to 10 ° C., especially from 15 ° C to 5 ° C, more preferably -10 ° C to 0 ° C and for example about -5 ° C; and the temperature of the beginning of the condensation of the composition according to the invention or heat transfer composition, the condenser is preferably 25 ° C to 80 ° C, especially 30 ° C to 60 ° C, more particularly preferred from 35 ° C to 55 ° C and for example about 50 ° C. All the embodiments described above can be combined with each other.

In the context of the invention, "between x and y" or "from x to y" means an interval in which the terminals x and y are included. For example, the range "between 1 and 1, 9%" includes in particular the values 1 and 1, 9%.

The following examples illustrate the invention without limiting it.

EXPERIMENTAL PART

Example 1

The following mixtures A to F were prepared from R32, R1234yf and propane with a constant composition of 21.5% by weight of R32. The composition of the propane was varied from 1.8 to 30% by weight relative to the total weight of the composition. Mix R1234yf R32 R290 Speed of

(% (% (propane) mass propagation) mass (% flame

mass) (cm / s)

A 76.7 21, 5 1, 8 <10 Invention

B 76.6 21.5 1, 9 <10 Invention

C 70.5 21, 5 8> 10 Comparative

D 68.5 21, 5 10> 10 Comparative

E 58.5 21, 5 20> 10 Comparative

F 48.5 21, 5 30> 10 Comparative

Table 1

Flame propagation rates are measured as indicated in ASHRAE 34-2013.

The experimental device for measuring the flame propagation velocity uses the vertical glass tube method (number of tube 2, length 150 cm, diameter 40 cm). The use of two tubes makes it possible to do two tests with the same concentration at the same time. The tubes are equipped with tungsten electrodes, the latter are placed at the bottom of each tube, 6.35 mm (1/4 inch) apart and are connected to a 15kV and 30mA generator.

Following the fractionation analysis according to the ASHRAE 34-2013 standard, the most critical composition of these mixtures (WCFF) is for a leak test at the boiling point + 10 ° C and for a filling of the cylinder at 90% in liquid phase at a temperature of 54.4 ° C (ASHRAE STANDARD 34-2013 Annex B, paragraph B2).

The calculations were done with the software Refprop version 9.

The compositions and flame propagation velocities after leakage (WCFF) are as follows: WCFF Com oositions

Speed mixing

spread of

R1234yf R32 propane flame (cm / s)

At 49.4 44.9 5.7 <10

B 47.1 46.4 6.5 <10

C 36.21 45 18.8> 10

D 33.26 44.8 22> 10

E 24.4 45.3 30.3> 10

F 19.94 47.4 32.6> 10

Table 2

The compositions after leakage of the mixtures A and B were also validated by measurements.

Example 2

Either a low-temperature refrigeration system that operates between an average evaporation temperature of -35 ° C, an average condensation temperature of 45 ° C, an overheating of 10 ° C and a subcooling of 5 ° C.

The isentropic efficiency of the compressor is 55%.

P (bar) Temperature (° C) 1 _23f R _4y

Massic%

p _r o _p ane

C ^d ^r u onense

t ^e a ^p ^r o ^r ae seen

^TTE e ^r ^p o ^r ea ^r ae seen

R454C 18.0 1.3 -37.0 -32.8 118 48.4 41.9 4.2 14.2 100 100

é ^ittt his AONA ^r ^p e ^r a ^p o ^r ⁱ aeu vuvu

VS

oo

OR

i ^t so ^r e com ^pr esser ^r u

21.5 77.5 1.0 18.2 1.3 -37.2 -32.8 119 48.4 41.5 4.4 14.1 101 100

^dt e ^p e ^r's ^r e ^r conense vuuu

21.5 77.3 1.2 18.3 1.3 -37.3 -32.8 119 48.4 41.5 4.5 14.1 102 100

e ^liiddtq his ^r e conense ^r uuu

21.0 77.6 1.4 18.2 1.3 -37.3 -32.8 118 48.4 41.3 ^{éli dt tt g} ssemeneem ^pr a ^r had 14.1 4.5 101 100

21.5 77.1 1.4 18.3 1.3 -37.3 -32.8 119 48.4 41.4 4, ^e 5 ^t a ^p o ^{r a} ^r y 14.1 102 100

21.0 77.3 1.7 18.2 1.3 -37.4 -32.8 118 48.4 41.2 4.5 1 ^said 4 ^r a ^pp o ^r e ^pr esson, 1 101 100

21.5 76.8 1.7 18.4 1.3 -37.4 -32.8 119 48.4 41.3 4.6 14.1 102 100

21.0 77.2 1.8 18.3 1.3 -37.4 -32.8 118 48.4 41.2 4.6 14.1 102 100

21.5 76.7 1.8 18.4 1.3 -37.4 -32.8 119 48.4 41.3 4.6 14.1 102 1% COP00

21.0 77.1 1.9 18.4 1.3 -37.2 -32.7 118 48.6 41.4 4.6 14.1 102 100

21.5 76.6 1.9 18.5 1.3 -37.3 -32.7 119 48.6 41.4 4.6 14.1 103 100

Table 3 The compositions advantageously have a volumetric capacity greater than that of the mixture R454C.

Claims

A composition comprising from 74% to 80% by weight of 2,3,3,3-tetrafluoropropene, from 19% to 25% by weight of difluoromethane, and from 1 to 1.9% by weight of propane, preferably from 1 to 1, 8% by weight of propane, relative to the total weight of the composition.

A composition according to claim 1, wherein the weight content of propane is selected from one of the following ranges: between 1.1% and 1.9%, between 1.2% and 1.9%, between 1.3% and 1.9%, between 1.4% and 1.9%, between 1.5% and 1.9%, between 1.6% and 1.9%, between 1.7% and 1.9%, between 1, 8% and 1, 9%, between 1,1% and 1,8%, between 1,1% and 1,7%, between 1,1% and 1,6%, between 1,1% and 1,1%, 1.5%, between 1.1% and 1.4%, between 1.1% and 1.3%, between 1.1% and 1.2%, between 1.2% and 1.8%, between 1, 2% and 1, 7%, between 1, 2% and 1, 6%, between 1.2% and 1.5%, between 1.2% and 1.4%, between 1.2% and 1%. , 3%, between 1, 3% and 1, 8%, between 1.3% and 1.7%, between 1.3% and 1.6%, between 1.3% and 1.5%, between 1% and 1%. , 3% and 1.4%, between 1, 4% and 1, 8%, between 1.4% and 1.7%, between 1.4% and 1.6%, between 1.4% and 1%, 5%, between 1.5% and 1.8%, between 1.5% and 1.7%, between 1.5% and 1.6%, between 1.6% and 1.8%, between 1% and 1%, 6% and 1.7%, or between 1.7% and 1.8%.

Composition according to any one of claims 1 or 2, wherein the weight content of 2,3,3,3-tetrafluoropropene chosen from among the following ranges: between 74% and 79%, 74% and 78%, 74% , 1% and 78%, 74.2% and 78%, 74.3% and 80%, 74.5% and 78%, 74.6% and 78%, 74.7% and 78%, 74.8%. % and 78%, 74.9% and 78%, 75% and 78%, 75.1% and 78%, 75.2% and 78%, 75.3% and 78%, 75.4% and 78% , 75.5% and 78%, 75.6% and 78%, 75.7% and 78%, 75.8% and 78%, 75.9% and 78%, 76% and 78%, 74% and 77.5%, 74% and 77%, 74% and 76.9%, 74% and 76.8%, 74 and 76.7%, 74% and 76.6%, 74% and 76.5%, 74% and 76.4%, 74% and 76.3%, 74% and 76.2%, 74% and 76.1%, 74% and 76%, 74.5% and 77.5%, 74%, 5% and 77%, 75% and 77.5%, or between 75% and 77%, preferably between 76% and 78%.

A composition according to any one of claims 1 to 3 comprising from 74.1% to 79.1% by weight of 2,3,3,3-tetrafluoropropene, from 19% to 24% by weight of difluoromethane, and from 1.9% by weight of propane, preferably from 1 to 1, 8% by weight of propane, relative to the total weight of the composition, said composition preferably comprising 1%, 1, 1%, 1, 2%, 1, 3%, 1, 4%, 1, 5%, 1, 6%, 1, 7%, 1, 8% or 1, 9% by weight of propane relative to the total weight of the composition.

A composition according to any one of claims 1 to 3, comprising from 76% to 79% by weight of 2,3,3,3-tetrafluoropropene, from 20% to 23% by weight of difluoromethane, and from 1% to 1%, 9% by weight of propane, preferably 1 to 1.8% by weight of propane, relative to the total weight of the composition, said composition preferably comprising 1%, 1, 1%, 1,

2%, 1,

3%, 1,

4%, 1,

5%, 1, 6%, 1, 7%, 1, 8% or 1, 9% by weight of propane relative to the total weight of the composition.

6. Composition according to any one of claims 1 to 5, chosen from one of the following compositions:

76.7% (± 0.5%) by weight of 2,3,3,3-tetrafluoropropene, 21.5% (± 0.5%) by weight of difluoromethane, and 1.8% (± 0%); 1% by weight of propane, relative to the total weight of the composition;

76.7% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.8% by weight of propane, relative to the total weight of the composition;

76.6% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.9% by weight of propane, relative to the total weight of the composition;

77.3% (± 0.5%) by weight of 2,3,3,3-tetrafluoropropene, 21.5% (± 0.5%) by weight of difluoromethane, and 1.2% (± 0%); 2% by weight of propane, relative to the total weight of the composition;

77.5 by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.0% by weight of propane, relative to the total weight of the composition;

77.3% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.2% by weight of propane, relative to the total weight of the composition; 77.1% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.4% by weight of propane, relative to the total weight of the composition;

77.6% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.4% by weight of propane, relative to the total weight of the composition;

77.0% (± 0.5%) by weight of 2,3,3,3-tetrafluoropropene, 21.5% (± 0.5%) by weight of difluoromethane, and 1.5% (± 0%); 4% by weight of propane, relative to the total weight of the composition;

77.3% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.7% by weight of propane, relative to the total weight of the composition;

76.8% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.7% by weight of propane, relative to the total weight of the composition;

77.2% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.8% by weight of propane, relative to the total weight of the composition;

77.1% by weight of 2,3,3,3-tetrafluoropropene, 21.0% by weight of difluoromethane, and 1.9% by weight of propane, relative to the total weight of the composition;

76.6% by weight of 2,3,3,3-tetrafluoropropene, 21.5% by weight of difluoromethane, and 1.9% by weight of propane, relative to the total weight of the composition.

7. Composition according to any one of claims 1 to 6, characterized in that it has a flame velocity of less than 10 cm / s, preferably less than or equal to 9.5 cm / s, preferably lower or equal to 9 cm / s, advantageously less than or equal to 8.5 cm / s, and in particular less than or equal to 8 cm / s.

8. Use of the composition according to any one of claims 1 to 7 as a heat transfer fluid.

9. Use of the composition according to any one of claims 1 to 8 in replacement of R455A or R454C.

10. heat transfer composition comprising the composition according to any one of claims 1 to 7, and at least one additive especially selected from nanoparticles, stabilizers, surfactants, tracer agents, fluorescers, odorants, lubricants, preferably based on polyol esters, and solubilizing agents.

1 1. Use of a composition according to any one of claims 1 to 8, or a heat transfer composition according to claim 10, in a heat transfer system containing a vapor compression circuit.

12. Heat transfer plant comprising a vapor compression circuit containing the composition according to any one of claims 1 to 7 or the heat transfer composition according to claim 10, in particular chosen from mobile or stationary heating installations. by heat pump, air conditioning, refrigeration, freezing and heat engines.

A method of heating or cooling a fluid or a body by means of a vapor compression circuit containing a heat transfer fluid or a heat transfer composition, said method comprising successively evaporation of the fluid or heat transfer composition, compression of the fluid or heat transfer composition, condensation of the fluid or heat transfer composition, and expansion of the fluid or heat transfer composition, wherein the heat transfer fluid is the composition of any one of claims 1 to 7, and the heat transfer composition is that according to claim 10.