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Improved formaldehyde recovery method

A formaldehyde and methanol technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of carbonyl compounds, etc., can solve the problems of high energy cost, long residence time, high capital cost and other problems in the recovery of formaldehyde

Inactive Publication Date: 2017-08-18
INVISTA TECHNOLOG IES S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To obtain low concentrations of formaldehyde, longer residence times are required and large butynediol reactors, or even a series of such reactors, are required, resulting in very high capital costs
In order to use higher concentrations of formaldehyde, much shorter reactor residence times are required, which results in high energy costs for formaldehyde recovery

Method used

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  • Improved formaldehyde recovery method

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Embodiment Construction

[0010] In view of the results of intensive studies of the foregoing, we have found that we can economically and efficiently recover unreacted formaldehyde from the butynediol synthesis reaction product composition downstream of the butynediol synthesis reactor. The process comprises: feeding a reaction product comprising unreacted formaldehyde to a column maintained at specified conditions, said column being associated with a reboiler; removing a vapor phase overhead comprising formaldehyde, water and methanol from the column stream, and at least a portion of the recovered overhead stream is passed to a condenser / steam riser maintained at specified conditions; Liquid phase stream of reacted formaldehyde for recycling to butynediol reactor and providing column reflux; raising steam in condenser / steam riser by heat exchange with column vapor phase overhead stream; steam lifter / steam riser and passing steam through a compressor to increase the vapor pressure before passing it to ...

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Abstract

The present invention provides an improved method for recovering unreacted formaldehyde from a butynediol synthesis reaction product downstream from a butynediol synthesis reactor.

Description

technical field [0001] In the manufacture of butanediol from feedstocks comprising acetylene, formaldehyde and hydrogen, the costs associated with the recycling of unreacted formaldehyde are critical to the operation of commercial petrochemical plants. The present invention relates to an improved method for optimizing energy use in the recycling of unreacted formaldehyde from butynediol reactor product. More specifically, the process comprises: feeding a stream comprising unreacted formaldehyde to a column maintained under specific conditions downstream of the butynediol synthesis reactor; removing the column top comprising formaldehyde, water and methanol from the column stream for recycle and treatment to remove some methanol; and removal of a bottoms stream comprising butynediol, water, methanol and less than 1 wt% (by weight) formaldehyde from the column for further processing to The desired quality of butanediol is produced. Energy optimization is achieved by raising st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/82C07C45/75C07C47/04
CPCC07C29/44C07C29/80C07C45/82C07C47/04C07C33/046
Inventor 格雷厄姆·R·艾尔德菲利普·N·沃德达仁·戈比德娜·吉亚西
Owner INVISTA TECHNOLOG IES S A R L