SEPARATION OF COMPOUNDS IN PROCESS STREAM - Union Carbide, Chemicals, And, Plastics, Technology, Corporation

Title:

SEPARATION OF COMPOUNDS IN PROCESS STREAM

Document Type and Number:

Japanese Patent JP3020084

Kind Code:

B2

Abstract:

PURPOSE: To provide a method for removing unwanted impurities and/or by- products by producing non-volatile salts thereof by use of reagents from an aqueous process stream in which such impurities and/or by-products are dissolved.
CONSTITUTION: This method comprises, for example, separating formaldehyde as a by-product from an alkylene oxide in a process wherein the alkylene oxide is produced from the corresponding alkene through catalytic epoxidation. This method comprises mixing formaldehyde with a reactant reactive preferentially with the formaldehyde under conditions of a process stream and producing a reaction product or products exhibiting lower volatility than formaldehyde in the aqueous solution, then, removing at least part of the reaction product or products from the process. This method is applicable to processes wherein, e.g. carbonyl-containing impurities, such as aldehydes or ketones, low molecular weight olefins, nitrogen-containing aromatic compounds, nitrogen-containing aliphatic compounds or inorganic compounds are contained as impurities. This method removes impurities on a continuous basis and can be conducted in combination with production processes.

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Inventors:

William, Christopher, Hoffman
John, Patrick, Diver

Application Number:

JP16159695A

Publication Date:

March 15, 2000

Filing Date:

June 06, 1995

Export Citation:

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Assignee:

Union Carbide, Chemicals, And, Plastics, Technology, Corporation

International Classes:

A62D3/00; A62D3/37; A62D3/38; B01J19/00; C07D301/32; A62D101/28; A62D101/40; (IPC1-7): C07D301/08

Domestic Patent References:

JP2174770A
JP69591A
JP1203375A
JP5507703A

Other References:

【文献】米国特許3816478(US,A)
【文献】米国特許3213113(US,A)
【文献】米国特許4691035(US,A)
【文献】米国特許5336791(US,A)

Attorney, Agent or Firm:

Rokuro Takagi (1 person outside)

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