Purification of a monomer by extraction with a phase former and crystallization
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C07C-051/42
출원번호
US-0541647
(2004-01-13)
등록번호
US-7495129
(2009-02-24)
우선권정보
DE-103 01 040(2003-01-13)
국제출원번호
PCT/EP04/000163
(2004-01-13)
§371/§102 date
20051118
(20051118)
국제공개번호
WO04/063134
(2004-07-29)
발명자
/ 주소
Balduf,Torsten
Nordhoff,Stefan
Yu Chiang,Dennis Thong
Kobus,Axel
Roos,Martin
출원인 / 주소
Evonik Stockhausen GmbH
대리인 / 주소
Smith Moore Leatherwood LLP
인용정보
피인용 횟수 :
9인용 특허 :
13
초록▼
The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double bond and obtainable by this proces
The invention concerns a process for purification of an acidic monomer having a double bond, as well as a device for synthesis of an acidic monomer having a double bond, a process for producing an acidic monomer having a double bond, an acid monomer having a double bond and obtainable by this process, fibers, formed bodies, films, foams, superabsorbent polymers and other special polymers based on or containing this acidic monomer, the use of this acidic monomer in or for producing fibers, formed bodies, films, foams, superabsorbent polymers or other special polymers.
대표청구항▼
What is claimed is: 1. A process for purification of an acidic monomer having a double bond, comprising the steps of: (a) providing a starting mixture, containing as starting mixture components, respectively based on the starting mixture, (a1) at least about 5 wt.% of the acidic monomer and either
What is claimed is: 1. A process for purification of an acidic monomer having a double bond, comprising the steps of: (a) providing a starting mixture, containing as starting mixture components, respectively based on the starting mixture, (a1) at least about 5 wt.% of the acidic monomer and either (a2) at least about 0.01 wt.% water, or (a3) at least about 0.01 wt.% of at least one starting mixture component comprising impurities which are different to the acidic monomers with the exception of water, or (a2) and (a3) wherein the sum of the wt.% proportions of the starting mixture components gives respectively 100 wt.%; (b) adding a phase former or a salt of this phase former or a mixture of both to obtain a purification mixture, from which (c) at least one first phase and an at least one further phase distinguished from the first phase by means of a phase boundary form a phase system; (d) lowering of the temperature of the phase system; wherein (e) in one of the phases of the phase system a product crystal containing at least about 50 wt.% of one of the starting mixture components is formed in addition to another starting mixture component as a crystal system; (f) isolating the product crystals wherein the acidic monomer is (meth) acrylic acid. 2. The process according to claim 1, wherein the temperature is lowered in only one phase of the phase system. 3. The process according to claim 2, wherein the temperature is lowered in the most monomer-rich phase of the phase system. 4. The process according to claim 1, wherein the acidic monomer has a pH value of less than about 7. 5. The process according to claim 1, wherein the phase former is a Br��onsted acid with a pH value of less than 6 or a salt of a Br��onsted acid or a mixture thereof. 6. The process according to claim 5, wherein the Br��onsted acid is sulphuric acid or one of its salts or a mixture thereof. 7. The process according to claim 1, wherein the phase former is liquid at the time of addition. 8. The process according to claim 1, wherein the purification mixture contains the phase former in a quantity in the range from about 1 to about 80 wt.%, based on the purification mixture. 9. The process according to claim 1, wherein at least one part of the phase former is recovered after formation of the phase systems and reused in step (b) of the staffing mixture. 10. The process according to claim 1, wherein the crystal system or the isolated monomer crystal or both are subjected to at least one further purification step.
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이 특허에 인용된 특허 (13)
Grinstead Robert R. (Walnut Creek CA), Extraction of carboxylic acids from dilute aqueous solutions.
Bernd Eck DE; Otto Machhammer DE; Theo Proll DE; Volker Schliephake DE; Joachim Thiel DE; Klaus Brollos DE, Method for producing acrylic acid and methacrylic acid.
Bauer ; Jr. William (Huntingdon Valley PA) Mason Robert M. (Roslyn PA) Upmacis Rita K. (North Wales PA), Process for purifying unsaturated carboxylic acids using distillation and melt crystallization.
Wojtech Bernhard (Bad Soden am Taunus DEX) Steppich Walter (Wiesbaden DEX) Freudenberger Dieter (Hofheim am Taunus DEX) Riedel Knut (Hofheim am Taunus DEX), Process for the extraction of carboxylic acids from dilute aqueous solutions.
Hengstermann, Axel; Meier, Ralf; Demicoli, Daniel; Roos, Martin; Guenzel, Bernd; Huebner, Frank, Method for isolation of laurolactam from a laurolactam synthesis process stream.
Hannen, Peter; Roos, Martin; Haeger, Harald, Method for producing dodeca-2,10-diene-1,12-dicarboxylic acid or 1,12-dodecane-dicarboxylic acid by way of ring-opening cross metathesis (ROCM) of cyclooctene with acrylic acid.
Hannen, Peter; Roos, Martin; Haeger, Harald, Unsaturated dicarboxylic acids from unsaturated cyclic hydrocarbons and acrylic acid by way of metathesis, the use thereof as monomers for polyamides, polyesters and polyurethanes, and subsequent reaction to diols and diamines.
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