EP1915405A2 - Verfahren zur deckung des bedarfs an polymerisaten i, die zu wenigstens 90 % ihres gewichtes acrylsäure, deren salze und/oder alkylester der acrylsäure radikalisch einpolymerisiert enthalten - Google Patents
Verfahren zur deckung des bedarfs an polymerisaten i, die zu wenigstens 90 % ihres gewichtes acrylsäure, deren salze und/oder alkylester der acrylsäure radikalisch einpolymerisiert enthaltenInfo
- Publication number
- EP1915405A2 EP1915405A2 EP06778142A EP06778142A EP1915405A2 EP 1915405 A2 EP1915405 A2 EP 1915405A2 EP 06778142 A EP06778142 A EP 06778142A EP 06778142 A EP06778142 A EP 06778142A EP 1915405 A2 EP1915405 A2 EP 1915405A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- acrylic acid
- gas mixture
- salts
- propylene
- propane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/04—Acids, Metal salts or ammonium salts thereof
- C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
Definitions
- acrylic acid can be prepared by heterogeneously catalyzed partial gas phase oxidation of propylene and / or of propane with molecular oxygen over catalysts in the solid state (cf., for example, EP-A 731 077, EP-A 1 254 709, EP-A).
- the acrylic acid (if appropriate also its salts, for example its alkali metal and / or ammonium salts which are obtainable by neutralization of acrylic acid with the corresponding bases such as alkali metal hydroxide (eg KOH, NaOH) or ammonia) and / or their alkyl esters are then frequently converted to polymers I polymerized containing at least 90% of its weight acrylic acid, their salts and / or their alkyl esters (alkyl acrylates) polymerized in a free radical and are used for a variety of uses (eg as adhesives, as water superabsorbent resins or as a binder).
- neutralization can also take place after the polymerization.
- the aim is to produce both acrylic acid, its salts and their alkyl acrylates, as well as the polymers I as economically as possible.
- the usual procedure is that the raw material base for the propane and / or propylene, namely petroleum or its distillates and / or natural gas from the regions of their natural occurrence into the countries I is exported.
- steam cracking or catalysts (eg hydrosilicates, "catalytic cracking") obtained mixtures of lower hydrocarbons, from which, as part of their distillative separation in so-called splinters, also isolates the propylene and propane contained in them in good purity.
- the propylene and / or propane thus obtained is then used in countries I and others for the production of acrylic acid.
- Demanding esterification and subsequent free-radical polymerization of acrylic acid (and, if appropriate, their salts, for example their alkali metal salts) and / or their alkyl esters to give polymers I forms the current procedure for meeting the demand for polymers I in countries I.
- a disadvantage of this procedure is that in countries I there is a predominant need for propane and propylene for purposes other than acrylic acid production.
- the propylene is used with a multiple amount needed mainly for the production of polypropylene.
- Propane is mainly used for energy production. That is, only a relatively small amount of demand of propylene or propane is used in countries I for acrylic acid production.
- the acrylic acid raw material base in countries I is comparatively expensive.
- Acrylic acid produced in countries II in such a cost-effective manner could then be exported to country I and further processed in it to meet the demand for polymers I.
- a disadvantage of such a procedure is that acrylic acid has a pronounced tendency to undesired free-radical polymerization.
- a ship transport of acrylic acid from countries Il to countries I would normally be done through different climate zones.
- the acrylic acid to be transported is either exposed to very different temperatures or has to be transported in a thermostated manner in a complex manner. In any case, during transport it must contain added significant additions of polymerization inhibitors (this also applies to a transport of their esters or salts), which subsequently have a disruptive effect on the preparation of polymers I.
- acrylic acid in itself forms by condensation reaction with itself first dimeric Michael adducts and by condensation with the same Michael oligomers. These also have a disadvantageous effect in the preparation of polymers I.
- the object of the present invention was therefore to provide a process for meeting the demand for polymers I in at least one of the countries I, which does not have the described disadvantages of the prior art processes.
- the advantage of the procedure according to the invention lies in the fact that the production of acrylic acid in at least one country II is particularly cost-effective, that the prices for the required for the production of acrylic acid raw materials propane and / or propylene are disproportionately low.
- a transport of the "acrylic acid" in the form of polymers I from countries II to countries I is then possible without any detriment to a transport of the acrylic acid itself.
- the need for polymers I in countries I can be more cost-effective
- a method for the production of acrylic acid from propane and / or propylene in countries II basically all known processes of the prior art according to the invention can be considered.
- crude propane which is understood as meaning propane which contains at least one analytically detectable constituent other than propane
- a first step comprises at least one partial dehydrogenation process selected from the group consisting of homogeneous dehydrogenation, heterogeneously catalyzed dehydrogenation and subjected to heterogeneously catalyzed oxydehydrogenation, wherein a propane and propylene-containing gas mixture 1 is produced.
- gas mixture 1 and / or gas mixture 1' as a constituent of a gas mixture 2 (in the simplest way, for example obtainable by adding the gas mixture 1 and / or gas mixture 1 ' molecular oxygen, air, or another mixture of molecular oxygen and inert gas is added, but the required oxygen may also have been added in advance in the production of the gas mixture 1) a heterogeneously catalyzed gas phase partial oxidation of gas mixture 1 and / or gas mixture Subjected 'contained propylene.
- all the steps of the process according to the invention are carried out in a single reaction zone and on a catalyst layer located in the same. as described, for example, in EP-A 608838, EP-A 529853, DE-A 19835247, EP-A 895809, EP-A 1192987, DE-A 10029338, WO 99/03825, DE-A 10118814, DE -A10119933, EP-A 603836, DE-A 19832033, DE-A 19836359, EP-A 962253 and EP-A 1193240. From the resulting product gas mixture, the acrylic acid can then be separated off as described in WO 04089856 and unreacted propane and propylene can be recycled to the reaction zone.
- the various steps are carried out in more than one reaction zone, e.g. EP-A 938463, EP-A 117146, DE-A 3313573, GB-A 2118939, US-A 31611670, WO 01/96270, EP-A 731077, DE-A
- the separation of the acrylic acid from the resulting product gas can also be carried out as described in these documents. The same applies to the recycling of unreacted propane and propylene.
- the resulting and purely separated acrylic acid can be neutralized as required with a base to their salts (eg with a metal hydroxide, or with amines) or with mono- or polyhydric alkanols, which preferably have 1 to 8 carbon atoms and are advantageously monovalent, on the Way of a direct reaction to obtain the corresponding alkyl acrylates are esterified.
- Suitable esterification catalysts are, for example, sulfuric acid, organic sulfonic acids (for example p-toluenesulfonic acid, methanesulfonic acid, benzenesulfonic acid or dodecylbenzenesulfonic acid) or sulfonic acid ion exchangers.
- the esterification can be carried out as described in DE-A 19604252, EP-A 784046, EP-A 781759, EP-A 790230 and EP-A
- Preferred esterification alkanols are methanol, ethanol, propanol, n-butanol, tert-butanol, sec-butanol and 2-ethylhexanol.
- Preferred bases are the alkali metal hydroxides, especially KOH and NaOH, and NH 3 .
- polymers I preferably have at least 95% of their weight, and very preferably at least 98% of their weight, of free-radical copolymerization of their salts and / or alkyl esters of acrylic acid.
- the acrylic acid can be copolymerized either as such or in the form of one of its salts, for example its alkali metal salts (eg Na and / or K salt).
- the polymers I may also have been partially or completely neutralized subsequently to their preparation by free-radical polymerization by means of NaOH and / or KOH and optionally with NH 3 (or with another base).
- radical polymerization and / or after completion of radical polymerization with, for example, alkali metal and / or ammonium hydroxide may be partially or fully neutralized in advance.
- Suitable superabsorbent polymers I are described, for example, in DE-A 10221202, DE-A 10221203 and in EP-A 1506153. As a rule, they contain no or at most in amounts of up to 10% by weight of esters of acrylic acid.
- polymers I which at least 90% or at least 95% of their weight contain acrylic acid and / or salts thereof (in particular their alkali metal and / or ammonium salts, preferably their Na salt) contain.
- acrylic acid and / or salts thereof in particular their alkali metal and / or ammonium salts, preferably their Na salt.
- nitriles such as acrylonitrile, methacrylonitrile, amides such as acrylamide and methacrylamide, N-vinyl amides such as N-vinylformamide, N-vinylacetamide and N-vinylpyrrolidone, vinyl esters of unsaturated C 1 -C 4 -carboxylic acids such as vinyl formate, vinyl acetate and vinyl propionate, but also esters of monoethylenically unsaturated C 3 -C 6 - carboxylic acids.
- Suitable mono-ethylenically unsaturated comonomers free of acid groups are styrene and alkyl-substituted styrenes, such as ethylstyrene or tert-butylstyrene.
- Such co-monomers may very generally be constituents of polymers I.
- polymers I which are suitable as superabsorbents also contain copolymerized crosslinking comonomers in small amounts (generally from 0.01 to 3% by weight).
- Comonomers which have 2, 3, 4 or 5 ethylenically unsaturated double bonds in the molecule are, for example, suitable as such. Examples include divinylbenzene and allyl acrylate.
- crosslinking compounds it is also possible for saturated or unsaturated polyfunctional compounds which have at least two (for example 2, 3, 4 or 5) functional groups which have a reactivity with respect to the carboxyl group of the acrylic acid or its salts (in particular its alkali metal salts). are complementary.
- suitable crosslinkers are also monoethylenically unsaturated compounds which, in addition to the ethylenically unsaturated double bond, have a further functional group which is complementary to carboxyl groups.
- hydroxyalkyl acrylates examples include hydroxyalkyl methacrylates.
- crosslinkers are polymers having a multiplicity of such complementary functional groups.
- Suitable initiators for the preparation of polymers I are, in particular, peroxo compounds, such as organic peroxides, organic hydroperoxides, hydrogen peroxide, persulfates, perborates, azo compounds and redox initiator systems.
- the production of a superabsorber can also include internal postcrosslinking.
- the free-radically produced polymer is reacted in advance of its drying with compounds which have at least two opposite carboxyl groups or -COO ⁇ groups have reactive groups. This reaction can be carried out at room temperature or at elevated temperatures up to 22O 0 C.
- Polymers I should encompass such crosslinked polymers.
- polymers I also include those polymers which, as described, have been obtained by free-radical polymerization, dried and optionally comminuted and then surface-crosslinked.
- surface crosslinking preference is given to using compounds which have at least two functional groups which can react with the functional groups, preferably the carboxyl or carboxylate groups, of the polymer with crosslinking.
- the postcrosslinkers preferably in the form of an aqueous solution, are applied to the surface of the polymer particles.
- the aqueous solution may contain water-miscible organic solvents.
- Suitable postcrosslinking agents are, for example, di- or polyglycidyl compounds, diols and polyols, and polyamines and polyamidoamines.
- the application of the crosslinker solution is preferably carried out by spraying a solution of the crosslinker.
- polymers I can generally be prepared by free-radical substance, solution, emulsion (especially aqueous) and suspension polymerization. These methods are known per se to the person skilled in the art and e.g. in DE-A 19602391 and WO 9727222. As a rule, the export of polymer material I will take place in at least one of the countries I by ship. In principle, however, a transport as air freight or in rail or road transport is possible. The transport of the polymers I can be carried out in bulk, as a solution, as an aqueous emulsion or as an aqueous suspension.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Paints Or Removers (AREA)
- Graft Or Block Polymers (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70755505P | 2005-08-12 | 2005-08-12 | |
DE102005038412A DE102005038412A1 (de) | 2005-08-12 | 2005-08-12 | Verfahren zur Deckung des Bedarfs an Polymerisaten I, die zu wenigstens 90% ihres Gewichtes Acrylsäure, deren Salze und/oder Alkylester der Acrylsäure radikalisch einpolymerisiert enthalten |
PCT/EP2006/065008 WO2007020192A2 (de) | 2005-08-12 | 2006-08-03 | Verfahren zur deckung des bedarfs an polymerisaten i, die zu wenigstens 90 % ihres gewichtes acrylsäure, deren salze und/oder alkylester der acrylsäure radikalisch einpolymerisiert enthalten |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1915405A2 true EP1915405A2 (de) | 2008-04-30 |
Family
ID=37000096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06778142A Pending EP1915405A2 (de) | 2005-08-12 | 2006-08-03 | Verfahren zur deckung des bedarfs an polymerisaten i, die zu wenigstens 90 % ihres gewichtes acrylsäure, deren salze und/oder alkylester der acrylsäure radikalisch einpolymerisiert enthalten |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1915405A2 (de) |
JP (1) | JP2009504826A (de) |
KR (1) | KR20080034203A (de) |
CN (1) | CN102015790A (de) |
CA (1) | CA2617955A1 (de) |
TW (1) | TW200710103A (de) |
WO (1) | WO2007020192A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104812418B (zh) * | 2012-11-26 | 2019-02-19 | 巴斯夫欧洲公司 | 基于可再生原料制备超吸收剂的方法 |
-
2006
- 2006-08-03 CA CA002617955A patent/CA2617955A1/en not_active Abandoned
- 2006-08-03 WO PCT/EP2006/065008 patent/WO2007020192A2/de active Application Filing
- 2006-08-03 JP JP2008525555A patent/JP2009504826A/ja active Pending
- 2006-08-03 KR KR1020087005908A patent/KR20080034203A/ko not_active Application Discontinuation
- 2006-08-03 EP EP06778142A patent/EP1915405A2/de active Pending
- 2006-08-03 CN CN2006800288309A patent/CN102015790A/zh active Pending
- 2006-08-11 TW TW095129628A patent/TW200710103A/zh unknown
Also Published As
Publication number | Publication date |
---|---|
TW200710103A (en) | 2007-03-16 |
WO2007020192A2 (de) | 2007-02-22 |
CA2617955A1 (en) | 2007-02-22 |
JP2009504826A (ja) | 2009-02-05 |
CN102015790A (zh) | 2011-04-13 |
KR20080034203A (ko) | 2008-04-18 |
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