GB1235208A - Purification of alkyl methacrylates - Google Patents

Purification of alkyl methacrylates

Info

Publication number
GB1235208A
GB1235208A GB6066668A GB6066668A GB1235208A GB 1235208 A GB1235208 A GB 1235208A GB 6066668 A GB6066668 A GB 6066668A GB 6066668 A GB6066668 A GB 6066668A GB 1235208 A GB1235208 A GB 1235208A
Authority
GB
United Kingdom
Prior art keywords
liquid
crystals
stream
methacrylate
alkyl methacrylate
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.)
Expired
Application number
GB6066668A
Inventor
Athey Clifton Stutler Jr
Max Statman
Alden Edward Blood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB1235208A publication Critical patent/GB1235208A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/68—Magnetic lenses using permanent magnets only
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/48—Separation; Purification; Stabilisation; Use of additives
    • C07C67/52—Separation; Purification; Stabilisation; Use of additives by change in the physical state, e.g. crystallisation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1,235,208. Purification of alkyl methacrylates. EASTMAN KODAK CO. 20 Dec., 1968 [26 Dec., 1967], No. 60666/68. Heading C2C. Alkyl methacrylates which are contaminated with impurities having melting points below - 50‹ C. are purified by cooling a liquid mixture of said methacrylate and impurities so as to form a slurry of crystals of said methacrylate in a liquid medium richer in said impurities and causing said crystals to flow in a stream counter to a stream of liquid alkyl methacrylate, which liquid has been formed by melting previously formed crystals of alkyl methacrylate and which is at a temperature such that the crystals in said counter flowing stream partially melt and some of the liquid crystallizes and separating the liquid containing the remaining unmelted crystals of purified alkyl methacrylate. In the above process a portion of said unmelted crystals may be melted and the liquid recycled to said stream of liquid alkyl methacrylate; a portion of said counter-flowing stream, after said crystals have passed in counter-current therethrough, may be mixed with fresh contaminated alkyl methacrylate and the mixture cooled to form the slurry. The slurry preferably contains from 50-65% by wt. of solids and the crystals in said slurry suitably flow downwards in a vertical tower up which said stream of liquid alkyl methacrylate flows, the temperature of the stream at the bottom of the tower being 20-30‹ C. higher than the temperature at the top of the tower. Examples are given in which the alkyl methacrylate is methyl methacrylate (which may be obtained by the oxidative dehydrogenation of methyl isobutyrate) and the main impurity is methyl butyrate. Suitable flow diagrams for carrying out the above process are described.
GB6066668A 1967-12-26 1968-12-20 Purification of alkyl methacrylates Expired GB1235208A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69339267A 1967-12-26 1967-12-26

Publications (1)

Publication Number Publication Date
GB1235208A true GB1235208A (en) 1971-06-09

Family

ID=24784465

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6066668A Expired GB1235208A (en) 1967-12-26 1968-12-20 Purification of alkyl methacrylates

Country Status (3)

Country Link
DE (1) DE1816795A1 (en)
FR (1) FR1598545A (en)
GB (1) GB1235208A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002481A1 (en) * 1997-07-12 1999-01-21 Ineos Acrylics Uk Limited Process for the production of methyl methacrylate
US6380427B1 (en) * 1997-07-30 2002-04-30 Mitsubishi Rayon Co., Ltd. Process for purification of (meth)acrylic acid
GB202118029D0 (en) 2021-12-13 2022-01-26 Mitsubishi Chemical Uk Ltd A process for purification of crude methyl methacrylate

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999002481A1 (en) * 1997-07-12 1999-01-21 Ineos Acrylics Uk Limited Process for the production of methyl methacrylate
US6670501B1 (en) 1997-07-12 2003-12-30 Lucite International Uk Limited Process for the production of methyl methacrylate
US6380427B1 (en) * 1997-07-30 2002-04-30 Mitsubishi Rayon Co., Ltd. Process for purification of (meth)acrylic acid
GB202118029D0 (en) 2021-12-13 2022-01-26 Mitsubishi Chemical Uk Ltd A process for purification of crude methyl methacrylate
WO2023111533A1 (en) 2021-12-13 2023-06-22 Mitsubishi Chemical UK Limited A process for purification of crude methyl methacrylate

Also Published As

Publication number Publication date
DE1816795A1 (en) 1969-07-17
FR1598545A (en) 1970-07-06

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