GB1165278A - Separation of Dimethylacetamide from Mixtures by Distillation - Google Patents

Separation of Dimethylacetamide from Mixtures by Distillation

Info

Publication number
GB1165278A
GB1165278A GB5684167A GB5684167A GB1165278A GB 1165278 A GB1165278 A GB 1165278A GB 5684167 A GB5684167 A GB 5684167A GB 5684167 A GB5684167 A GB 5684167A GB 1165278 A GB1165278 A GB 1165278A
Authority
GB
United Kingdom
Prior art keywords
mixture
distillation
dmac
column
dimethylacetamide
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
GB5684167A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB1165278A publication Critical patent/GB1165278A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42Separation; Purification; Stabilisation; Use of additives
    • C07C51/43Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C07C51/44Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1,165,278. Dimethylacetamide, separation from acatic acid by distillation. E. I. DU PONT DE NEMOURS & CO. 14 Dec., 1967 [15 Dec., 1966], No. 56841/67. Heading BIB. [Also in Division C2] N,N-Dimethylacetamide (DMAC) is separated from a mixture containing it together with acetic acid by submitting the mixture to consecutive fractional distillation operations at different pressures. If. for example, the DMAC concentration in the initial mixture exceeds that in the DMAC/HAc azeotrope, the mixture is preferably submitted to distillation in a column maintained at reduced pressure (e.g. 50 to 300 mm. Hg) to distil off DMAC until the composition of the residual mixture, approaches the azeotropic composition. The residual mixture is then distilled at atmospheric pressure to recover acetic acid as distillate. The cycle of low-pressure and highpressure operations may then be repeated. In continuous operations, it is convenient to employ two distillation columns operated at different pressures. The bottoms fraction from each column is introduced into the middle of the other column; and additional starting mixture is fed to either column determined by its composition.
GB5684167A 1966-12-15 1967-12-14 Separation of Dimethylacetamide from Mixtures by Distillation Expired GB1165278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US60185166A 1966-12-15 1966-12-15

Publications (1)

Publication Number Publication Date
GB1165278A true GB1165278A (en) 1969-09-24

Family

ID=24409019

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5684167A Expired GB1165278A (en) 1966-12-15 1967-12-14 Separation of Dimethylacetamide from Mixtures by Distillation

Country Status (5)

Country Link
BE (1) BE707979A (en)
DE (1) DE1668567A1 (en)
FR (1) FR1549711A (en)
GB (1) GB1165278A (en)
NL (1) NL6717010A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005531634A (en) * 2002-07-01 2005-10-20 マリンクロッド・インコーポレイテッド Purification of N, N-dimethylacetamide
CN100342986C (en) * 2004-12-22 2007-10-17 哈尔滨工业大学 Method for reclaiming dimethyl acetamide from cefoperazone sodium production waste liquid
CN111454169A (en) * 2020-03-31 2020-07-28 苏州予信天材新材料应用技术有限公司 Method for recovering waste organic solvent containing N, N-dimethylacetamide
CN112574059A (en) * 2019-09-29 2021-03-30 中国石油化工股份有限公司 Separation of N, N-dimethylacetamide-acetic acid mixed system
CN114057596A (en) * 2020-07-31 2022-02-18 中国石油化工股份有限公司 Method for removing organic acid in dimethylacetamide
CN114436883A (en) * 2020-10-19 2022-05-06 中国石油化工股份有限公司 Method for recovering N, N-dimethylacetamide from multi-component solution system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005531634A (en) * 2002-07-01 2005-10-20 マリンクロッド・インコーポレイテッド Purification of N, N-dimethylacetamide
CN1326586C (en) * 2002-07-01 2007-07-18 马林克罗特公司 Purification of N,N-dimethylacetamide
CN100342986C (en) * 2004-12-22 2007-10-17 哈尔滨工业大学 Method for reclaiming dimethyl acetamide from cefoperazone sodium production waste liquid
CN112574059A (en) * 2019-09-29 2021-03-30 中国石油化工股份有限公司 Separation of N, N-dimethylacetamide-acetic acid mixed system
CN112574059B (en) * 2019-09-29 2022-10-11 中国石油化工股份有限公司 Separation of N, N-dimethylacetamide-acetic acid mixed system
CN111454169A (en) * 2020-03-31 2020-07-28 苏州予信天材新材料应用技术有限公司 Method for recovering waste organic solvent containing N, N-dimethylacetamide
CN111454169B (en) * 2020-03-31 2023-03-28 苏州予信天材新材料应用技术有限公司 Method for recovering waste organic solvent containing N, N-dimethylacetamide
CN114057596A (en) * 2020-07-31 2022-02-18 中国石油化工股份有限公司 Method for removing organic acid in dimethylacetamide
CN114436883A (en) * 2020-10-19 2022-05-06 中国石油化工股份有限公司 Method for recovering N, N-dimethylacetamide from multi-component solution system

Also Published As

Publication number Publication date
NL6717010A (en) 1968-06-17
DE1668567A1 (en) 1971-09-02
FR1549711A (en) 1968-12-13
BE707979A (en) 1968-06-14

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees