GB1319870A - Separation by crystallization - Google Patents

Separation by crystallization

Info

Publication number
GB1319870A
GB1319870A GB5312971A GB5312971A GB1319870A GB 1319870 A GB1319870 A GB 1319870A GB 5312971 A GB5312971 A GB 5312971A GB 5312971 A GB5312971 A GB 5312971A GB 1319870 A GB1319870 A GB 1319870A
Authority
GB
United Kingdom
Prior art keywords
compound
mixture
melt
water
crystallizing
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
GB5312971A
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.)
Monsanto Co
Original Assignee
Monsanto 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 Monsanto Co filed Critical Monsanto Co
Publication of GB1319870A publication Critical patent/GB1319870A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
    • C07C201/06—Preparation of nitro compounds
    • C07C201/16—Separation; Purification; Stabilisation; Use of additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0009—Crystallisation cooling by heat exchange by direct heat exchange with added cooling fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/005—Selection of auxiliary, e.g. for control of crystallisation nuclei, of crystal growth, of adherence to walls; Arrangements for introduction thereof
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C205/00—Compounds containing nitro groups bound to a carbon skeleton
    • C07C205/07—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by halogen atoms
    • C07C205/11—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by halogen atoms having nitro groups bound to carbon atoms of six-membered aromatic rings
    • C07C205/12—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by halogen atoms having nitro groups bound to carbon atoms of six-membered aromatic rings the six-membered aromatic ring or a condensed ring system containing that ring being substituted by halogen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C7/00—Purification; Separation; Use of additives
    • C07C7/14—Purification; Separation; Use of additives by crystallisation; Purification or separation of the crystals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

1319870 Crystallizing from a melt MONSANTO CO 16 Nov 1971 [17 Nov 1970] 53129/71 Heading BIG An organic compound having a melting point above 0‹C at one atmosphere is separated from a molten mixture having zero or low solubility in water and in which the compound is present with one or more organic compounds, by crystallizing the compound from the melt in the presence of water, and separating crystals of the compound from the melt liquor. A minor amount of a caustic compound may be present during crystallization. The mixture is preferably a mixture of isomers, e.g. a mixture of nitrochlorobenzenes from which p-nitrochlorobenzene is separated. The crystallisation is effected by feeding the molten mixture into a crystallizer containing water and the caustic compound, to a level just above a stirrer, withdrawing the slurry and separating the crystals by a centrifuge. The crystallizer and centrifuge are maintained at an elevated temperature to prevent solidification of the melt.
GB5312971A 1970-11-17 1971-11-16 Separation by crystallization Expired GB1319870A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9047670A 1970-11-17 1970-11-17

Publications (1)

Publication Number Publication Date
GB1319870A true GB1319870A (en) 1973-06-13

Family

ID=22222934

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5312971A Expired GB1319870A (en) 1970-11-17 1971-11-16 Separation by crystallization

Country Status (5)

Country Link
BE (1) BE775337A (en)
CA (1) CA952424A (en)
DE (1) DE2156880A1 (en)
FR (1) FR2114772A5 (en)
GB (1) GB1319870A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113845506A (en) * 2021-10-18 2021-12-28 惠州市宙邦化工有限公司 Dynamic crystallization purification method of ethylene carbonate

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TR23271A (en) * 1987-02-06 1989-08-09 Krupp Koppers Gmbh PROCEDURE FOR THE GAIN OF P-KSILOL AT THE MINIMUM OF 95.5% PURITY
DE58902934D1 (en) * 1988-05-05 1993-01-21 Krupp Koppers Gmbh METHOD FOR OBTAINING P-XYLOL WITH A PURITY OF AT LEAST 99.5%.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113845506A (en) * 2021-10-18 2021-12-28 惠州市宙邦化工有限公司 Dynamic crystallization purification method of ethylene carbonate
US11958820B2 (en) 2021-10-18 2024-04-16 Shenzhen Capchem Technology Co., Ltd. Method for purifying ethylene carbonate through dynamic crystallization

Also Published As

Publication number Publication date
DE2156880A1 (en) 1972-05-25
BE775337A (en) 1972-05-16
FR2114772A5 (en) 1972-06-30
CA952424A (en) 1974-08-06

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Legal Events

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