CN1523085A - Additives for liquefied petroleum gas for automobiles - Google Patents

Abstract

The composition of additive for car liquefied petroleum gas contains (by weight mixing ratio) at least one oxygen-containing organic solvent 40-60, at least one inhibitor 5-15, at least one oxygen-containing nonionic surfactant 40-60 and at least one antioxidant 5-15. The above-mentioned oxygen-containing organic solvent is selected from methyl (ethyl) alcohol, MTBE or dimethyl ether, the described inhibitor is selected from p-tert-butylcatechol, p-benzenediol or 2,2-diphenylol propane, the described antioxidant is selected from 2,2-methylene diphenol or styrenated phenol, and the described oxygen-containing nonionic surfactant is selected from alkylphenol ethoxylate, polyoxyethylene fatty alcohol or dodecyl acylalcohol amine.

Description

Additives for liquefied petroleum gas for automobiles

Technical field

The invention relates to an additive for liquefied petroleum gas used as automobile fuel, in particular to an additive for liquefied petroleum gas containing a certain amount of olefin used as automobile fuel.

Background technique

Many large and medium-sized cities in my country have already used liquefied petroleum gas as vehicle fuel, which has a positive effect on reducing vehicle exhaust pollution and improving urban environmental quality. The use of liquefied petroleum gas as automobile fuel should meet the requirements of automobile driving stability, flexibility, no corrosion to automobile parts, and no wear and tear. LPG for vehicles abroad mainly comes from oil and gas fields. Because it mainly contains saturated C ₃ -C ₄ hydrocarbons, problems such as polymerization and coking will not occur. my country's liquefied petroleum gas mainly comes from the cracked gas of refineries and ethylene plants, which contains a considerable amount of unsaturated olefins, and it is easy to cause failure when directly used as automobile fuel. Therefore, physical or chemical methods should be used in advance to meet the requirements of vehicles.

Now there are three ways to solve the above problems. One is to use the alkane gas produced by oil and gas fields, which has good quality but limited resources; the other is to remove the unsaturated olefins through the olefin superposition process, but the cost is high; the third is to use liquefied petroleum with high olefin content produced by refineries Gas can be directly used as automobile fuel, with low cost and close resources, etc., but the olefins in it are easy to polymerize under the conditions of vehicles, which will cause carbon deposition and coking on the nozzles and valves of automobile engines, and reduce the power performance of automobiles. In addition, when liquefied petroleum gas is used, it contains a small amount of tar-like residue, which will cause the solenoid valve in the automobile gas system and the valve disc of the gasification evaporator to bond and fail for a long time. Especially in winter, it is more difficult to start the car, the evaporator is blocked, and the power performance declines. It is necessary to clean up the carbon deposits and coke once every 1-2 months, etc., which will affect the normal operation of the car.

Contents of Invention

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method that can prevent and reduce the carbon deposition and coking of the nozzle of the automobile engine, the valve of the valve, the solenoid valve of the combustion system, the valve disc of the gasification evaporator, etc. Additives for liquefied petroleum gas used in automobiles to increase the number of cokes and increase the operating cycle of automobiles.

The purpose of the present invention is to be achieved through the following technical solutions.

An additive for liquefied petroleum gas for automobiles is characterized in that it is made from the following raw materials in weight ratio:

At least one oxygen-containing organic solvent 40-60 At least one polymerization inhibitor 5-15

At least one oxygen-containing nonionic surfactant 40-60 At least one antioxidant 5-15

In the above additive, the oxygen-containing organic solvent is selected from isopropanol, methyl ethyl ketone, methanol, ethanol, methyl tert-butyl ether (MTBE), methyl butyl ether, dimethyl ether or propylene glycol ether.

As for the above-mentioned additive, the polymerization inhibitor is selected from p-tert-butylcatechol, hydroquinone or 2,2-diphenol-based propane.

In the above additive, the antioxidant is selected from 2,2-methylene bisphenol, styrenated phenol or 2,6-di-tert-butyl-4-methylphenol.

In the above additive, the oxygen-containing nonionic surfactant is selected from the group consisting of: alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, nonylphenol polyoxyethylene ether or lauryl alcohol amine.

Alkylphenol polyoxyethylene ethers in the oxygen-containing nonionic surfactants mentioned above are selected from C ₈ or C ₉ alkylphenol polyoxyethylene ethers; fatty alcohol polyoxyethylene ethers are selected from: fatty alcohol polyoxyethylene ( 3) Ether ~ fatty alcohol polyoxyethylene (9) ether, etc. (AEO-3 ~ AEO-9); nonylphenol polyoxyethylene ether is selected from: nonylphenol polyoxyethylene (4) ether (TX-4), Nonylphenol polyoxyethylene (7) ether (TX-7), nonylphenol polyoxyethylene (9) ether (TX-9), etc. The composition and content of additives are related to the composition and olefin content in liquefied petroleum gas. With the appropriate increase in dosage, the combustion of liquefied petroleum gas will be significantly improved.

Various raw materials used in the present invention can be purchased from the market.

The automotive liquefied petroleum gas additive provided by the present invention can effectively prevent the polymerization of olefins in the liquefied petroleum gas from causing the above-mentioned engine nozzles and valve volumes through the comparative experiments of the carburetor series of Jetta cars and buses. Carbon coking; prevent the electromagnetic valve of the combustion system, the valve disc of the gasification evaporator, etc. Ensure the safe and stable operation cycle of the car. The car engine is easy to ignite and start; the idling speed of the car engine is stable and no longer stalls; the power of the car engine is increased and the explosive power is strong; fuel saving, the Jetta sedan saves 2-3 liters of liquefied petroleum gas on average per 100 kilometers. At the same time, it can reduce environmental pollution and further improve environmental quality.

Detailed ways

Now in conjunction with specific embodiment the present invention is further described as follows:

Example 1

(1) Preparation of additives for liquefied petroleum gas for automobiles

Table 1 is by the weight proportion of various raw materials of technical scheme of the present invention, takes the raw material (kg) of required quantity Organic solvents Polymerization inhibitor antioxidant nonionic surfactant Methanol p-tert-butyl bisphenol 2,2-Methylene bisphenol AEO-5 9 1 1 9

Put it in a container, stir it to make it mix evenly, and then the said additive can be obtained.

(2) Preparation of liquefied petroleum gas containing the above-mentioned additives for automobiles

20,000 kg of liquefied petroleum gas is housed in the storage tank, and the composition (wt%) of the liquefied petroleum gas is determined by GPC chromatography as shown in Table 2 below (total olefin content 35.30%). propane Propylene Isobutane n-butane Iso(n)butene Anti-butene Butene other 22.7 3.5 32.5 8.7 16.0 14.9 0.9 0.8

Add 20kg of the above-mentioned additive (accounting for 0.1% of the weight of the liquefied petroleum gas) to the above-mentioned liquefied petroleum gas to obtain liquefied petroleum gas containing the additive.

Example 2

(1) Preparation of additives for liquefied petroleum gas for automobiles (same example 1)

Table 3 is by the weight proportion of various raw materials of technical scheme of the present invention, takes the raw material (kg) of required amount Organic solvents Polymerization inhibitor nonionic surfactant antioxidant ethanol+MTBE Hydroquinone + 2,2-diphenol propane AEO ₃ + Propylene Glycol Ether Styrenated phenol + 2,2-di-tert-butyl-4-methylphenol 20+20 6.7+3.3 26.7+13.3 3.3+6.7

(2) Preparation of liquefied petroleum gas containing the above additives for automobiles

20000kg liquefied petroleum gas composition (wt%) is housed in the storage tank as shown in Table 4 (total olefin content 45.9%) propane Propylene Isobutane n-butane n-(iso)butene Anti-butene Butene other 15.8 6.5 30.1 7.6 11.4 12.3 15.7 0.6

Add 100kg of additives (accounting for 0.5% by weight of the total liquefied petroleum gas) to the above-mentioned liquefied petroleum gas.

Example 3

(1) Preparation of additives for liquefied petroleum gas for automobiles (same example 1)

Table 5 is by the weight proportion of various raw materials of technical scheme of the present invention, takes the raw material (kg) of required quantity Organic solvents Polymerization inhibitor antioxidant nonionic surfactant Dimethyl ether + Methanol 2,2-Diphenolic propane Styrenated phenol C8 Alkylphenol Polyoxyethylene Ether 13.95+9.30 4.65 9.3 23.25

(2) Preparation of liquefied petroleum gas prepared above for automobiles

20000kg of liquefied petroleum gas is housed in the storage tank, and its composition (wt%) is shown in Table 6 (wherein the total olefin content is 41.9%).

Table 6: propane Propylene Isobutane n-butane Iso(n)butene Anti-butene Butene other 20.5 4.1 29.7 7.2 12.2 16.7 8.9 0.7

Add 60.45 kg of the additive prepared above to the liquefied petroleum gas (accounting for 0.3% of the weight of the liquefied petroleum gas).

Example 4

(1) Preparation of additives for liquefied petroleum gas for automobiles (same example 1)

Table 7 is by the weight proportion of various raw materials of technical scheme of the present invention, takes the raw material (kg) of required quantity Organic solvents Polymerization inhibitor antioxidant nonionic surfactant Isopropanol + methyl ethyl ketone Quinol 2,2-di-tert-butyl-4-methylphenol C9 alkylphenol polyoxyethylene ether+TX-4 6+7.5 1.5 1.5 7.5+6

(2) Preparation of liquefied petroleum gas containing the above-mentioned additives for automobiles

The liquefied petroleum gas of 20000kg is housed in the storage tank, records its composition (wt%) as shown in example 1 table 2 (total olefin content 35.3%)

Add 30kg of the above-mentioned additive (accounting for 0.15% of the weight of the liquefied petroleum gas) to the above-mentioned liquefied petroleum gas to obtain liquefied petroleum gas containing additives for automobiles.

Example 5

(1) Preparation of additives for liquefied petroleum gas for automobiles (same example 1)

Table 8 is by the weight proportion of various raw materials of technical scheme of the present invention, takes the raw material (kg) of required quantity Organic solvents Polymerization inhibitor antioxidant nonionic surfactant Dimethyl ether + propylene glycol ether 2,2-Diphenol propane 2,2-di-tert-butyl-4-methylphenol+2,2-methylene bisphenol TX-7+AEO-7 16.1+19.3 6.4 12.9 19.3+16.1

(2) Preparation of liquefied petroleum gas containing the above-mentioned additives for automobiles

The composition of 20000 kg of liquefied petroleum gas in the storage tank is the same as the data given in Table 4 in Example 2 (the total olefin content is 45.9%). 90.1 kg (accounting for 0.45% by weight of liquefied petroleum gas) of the additives given in Table 8 was added thereto.

Example 6

(1) Preparation of additives for liquefied petroleum gas for automobiles (same example)

Table 9 is by the weight proportion of various raw materials of technical scheme of the present invention, takes the raw material (kg) of required quantity Organic solvents Polymerization inhibitor antioxidant nonionic surfactant MTBE+Dimethyl ether Hydroquinone + 2,2-diphenol propane Styrenated phenol + 2,2-methylene bisphenol AEO-8 15+10 2+3.5 3+3.5 27

(2) Preparation of liquefied petroleum gas containing the above-mentioned additives for automobiles

20000kg of liquefied petroleum gas in the storage tank, its composition (wt%) is shown in Table 6 in Example 3 (total olefin content is 41.9%).

Add 64 kg of additives prepared in Table 9 to the above-mentioned liquefied petroleum gas (accounting for 0.32% of the weight of the liquefied petroleum gas).

Claims (8)

1, a kind of automobile additive of liquefied petroleum gas (LPG) is characterized in that it is to be made by the following weight proportion raw material:

At least a at least a stopper 5-15 of oxygen organic solvent 40-60 that contains

At least a at least a oxidation inhibitor 5-15 of oxygen nonionogenic tenside 40-60 that contains

2, additive according to claim 1 is characterized in that the described oxygen organic solvent that contains is selected from Virahol, methylethylketone, methyl alcohol, ethanol, methyl tertiary butyl ether, methyl butyl ether, dme or propylene glycol.

3, additive according to claim 1 is characterized in that described stopper is selected from: p-ten.-butylcatechol, Resorcinol or 2,2-diphenylol propane.

4, additive according to claim 1 is characterized in that described oxidation inhibitor is selected from: 2, and 2-methylene-bis phenol, styrenated phenol or 2,6 di tert butyl 4 methyl phenol.

5, additive according to claim 1 is characterized in that the described oxygen nonionogenic tenside that contains is selected from: alkylphenol polyoxyethylene, fatty alcohol-polyoxyethylene ether, polyoxyethylene nonylphenol ether or dodecyl acyl hydramine.

6, additive according to claim 5 is characterized in that described alkylphenol polyoxyethylene is selected from: C ₈Alkylphenol polyoxyethylene or C ₉Alkylphenol polyoxyethylene.

7, additive according to claim 5 is characterized in that described fatty alcohol-polyoxyethylene ether is selected from: aliphatic alcohol polyethenoxy (3) ether～aliphatic alcohol polyethenoxy (9) ether.

8, additive according to claim 5 is characterized in that described polyoxyethylene nonylphenol ether is selected from: Nonyl pheno (4) ether, Nonyl pheno (7) ether, Nonyl pheno (9) ether.