Methods for edulcoration and desalinization of 1,3-methyl glycol fermentation liquor

Abstract

An impurity removing and desalting method for 1, 3-propanediol zymotic fluid relates to a 1, 3-propanediol zymotic fluid, which provides the An impurity removing and desalting method for 1, 3-propanediol zymotic fluid. Micro filtering impurity removing is that the 1, 3-propanediol zymotic fluid with germ is preprocessed by a filtering bag and enters a ceramics film device micro for micro filtering impurity removing. The germ body and protein macromolecular matter are removed from zymotic fluid to get the zymotic filter fluid of the 1, 3-propanediol. The salt removing by electrodialysis is that zymotic filter fluid containing the 1, 3-propanediol is put into an electrodialysis device to remove salt and completes when filtrate conductance is reduced to 2000 us. Therefore, the electrodialysis operation is stopped. The filter fluid enters the following technics for condensation and purification. The invention has a bigger film flux, a good treating effect and light ion exchanging film pollution. The salt removing by electrodialysis has low energy consumption and good treating effect. The conductance of material liquid can be completely reduced to 2000 us to satisfy techincs demand of following concentration and distillation. The loss rate of the 1, 3-propanediol is low with little environment pollution.

Description

technical field [0001] The invention relates to a 1,3-propanediol fermentation liquid, in particular to a method for removing impurity and desalination of the 1,3-propanediol fermentation liquid by combining ceramic membrane filtration technology and electrodialysis technology. Background technique [0002] 1,3-propanediol (PDO) is an important chemical raw material and an important monomer for the synthesis of polytrimethylene terephthalate (PTT). PTT is a polyester polymer that has newly realized industrial-scale synthetic fibers after polyethylene terephthalate (PET) in the 1950s and polybutylene terephthalate (PBT) in the 1970s. Material is a new type of polyester material with great development prospects and has a wide range of application prospects. In addition, PDO can also be used in ink, medicine, antifreeze and other fields. [0003] The current PDO production methods mainly include the acrolein method and the ethylene oxide method. These two methods have problem...

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Problems solved by technology

[0009] The purpose of the present invention is to adopt fermentation method to produce 1 in industry at present, the production cost that exists in the follow-up separation and purification process after fermentation of 3-propanediol is high, and production capacity is little, and the salt content of feed liquid is high, makes follow-up concentrated evaporation, distillation, Provide a method for removing impurities and desalting of 1,3-propanediol fermentation broth to solve problems such as rectification with high boiling point and high energy consumption

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