Title:
SEVEN-TOWER FIVE-EFFECT RECTIFICATION SYSTEM FOR DMAC OR DMF WASTE LIQUID AND METHOD FOR RECOVERING SAME
Document Type and Number:
WIPO Patent Application WO/2017/190299
Kind Code:
A1
Abstract:
A method for recovering a DMAC or DMF waste liquid using seven-tower five-effect rectification. The waste liquid comprising DMAC or DMF is entered into a DMAC or DMF finished product tank after being successively processed via a preheater, a first concentrating tower, a second concentrating tower, a third concentrating tower, a fourth concentrating tower, a flash drum, a fifth concentrating tower, a rectifying tower and a deacidification tower in the method. The method resolves the problem of solid waste pollution and realizes the recycling of high boilers and solid matter. DMAC and DMF are not decomposed substantially, and the recovering rate of a DMAC or DMF finished product is more than 99%. A seven-tower five-effect rectification system for the DMAC or DMF waste liquid to implement the recovering method is also disclosed.
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Inventors:
ZHANG XUYUAN (CN)
Application Number:
PCT/CN2016/081061
Publication Date:
November 09, 2017
Filing Date:
May 05, 2016
Export Citation:
Assignee:
ZHANG XUYUAN (CN)
International Classes:
C02F9/10; C07C231/24; C07C233/03; C07C233/05
Foreign References:
| CN104944661A | 2015-09-30 | |||
| CN204625416U | 2015-09-09 | |||
| CN104370768A | 2015-02-25 | |||
| CN104815447A | 2015-08-05 | |||
| US20030089593A1 | 2003-05-15 |
Attorney, Agent or Firm:
WENZHOU PINCHUANG PATENT AND TRADEMARK AGENCY OFFICE et al. (CN)
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