CN206799473U - A kind of 1,3 propanediol fermentation liquor desalination impurity removed systems - Google Patents

Abstract

The propanediol fermentation liquor desalination impurity removed system of the utility model one kind 1,3, the system include：Electrodialysis desalination device, multi-effect evaporating device, thick distillation unit, scraper evaporator；Described electrodialysis plant is connected with multi-effect evaporating device；Described multi-effect evaporating device is connected with thick distillation unit；Described thick distillation unit is connected with scraper evaporator.Tthe utility model system solves the problem of remaining in salt fouling in topping still in PDO concentrates, causing equipment capacity to decline, and favourable guarantee is provided for PDO continuous and stable productions.

Description

A kind of 1,3- propanediol fermentation liquors desalination impurity removed system

Technical field

The invention belongs to biological chemical field, is related specifically to the desalination removal of impurities of Production of 1,3-Propanediol by Fermentation Method process System.

Background technology

1,3- propane diols（PDO）It is a kind of important industrial chemicals, is synthesis memory fiber poly terephthalic acid propane diols Ester（PTT）Critical materials.Ptt fiber is a kind of tencel of good properties, the flexibility not only with cotton material but also has nylon Toughness, resilience and the advantages that uvioresistant, therefore as the emphasis of numerous chemical fiber factories research and development.PDO production master Have bioanalysis and chemical method, bioanalysis and chemical method PDO production technologies are for a long time by Liang Ge trans-corporations --- E.I.Du Pont Company and Shell Co. Ltd monopolizes so that ptt fiber can not mass produce always.Tsing-Hua University, Dalian University of Science ＆ Engineering until recent year University and East China University of Science develop the bioanalysis PDO production technologies with independent intellectual property right, gradually by being continually striving to Monopolization of the offshore company to PDO production technologies is broken.It is the most ripe with the bioanalysis PDO production technologies of Tsing-Hua University among these With advanced, its PDO yield height, extract yield height, product quality stabilization.My company develops PDO cooperatively with Tsing-Hua University and produces skill Art, implement the production of bioanalysis PDO technology commercializations, to meet the needs of group internal PTT polymerization units.

Using microbial fermentation production PDO occurs for bioanalysis PDO technologies, while producing PDO in microbial metabolism, also Succinic acid, acetic acid, the organic acid such as lactic acid are produced, in order to maintain the pH value of zymotic fluid neutral, by robot control system(RCS) toward in zymotic fluid The sodium hydroxide solution of auto-feeding 30%, therefore after fermentation ends, salt content reaches 2-3% in zymotic fluid.

The desalination process of existing PDO zymotic fluids mainly has：Electroosmose process（The such as Wang Xiaolin, Gong Yan, Tang Yu electrodialysis is used In desalinating process [P] Chinese patents of 1,3- propanediol fermentation liquors：031048714.2003-2-21）, ion-exchange（Wang Chong Removal methods [P] Chinese patents of thalline, albumen and pigment in brightness .1,3- propanediol fermentation liquors： 200510047504.X.2005-10-19）, nanofiltration desalination method（The such as Jin Ping, Wang Lingmin, Wang Chonghui microbial fermentations produce 1,3- Method [P] Chinese patents of propane diols：200710011414.4.2008-11-19.）, alcohol deposition method（Will dragon is repaiied, Zhang Daijia is high Method [P] Chinese patents of extraction separation 1,3- propane diols in the microbial fermentation solutions such as plain army：031335845. 2003- 6-2.）, condensing crystallizing method（A kind of extraction process of Production of 1,3-Propanediol by Fermentation Method [P] of the such as Liu Dehua, Yang Dehua, Hao Jian Chinese patent：2007100655588.2007-4-16.）Deng.

Ion exchange desalination process salt rejection rate is high, but resin for the desalination of PDO zymotic fluids be present and need frequent regeneration, produces big The shortcomings of measuring acid-base waste fluid, it is difficult to realize industrialization amplification.Nanofiltration desalination method is generally used for the pre- of protein compression and counter-infiltration Processing procedure, it is extremely low for the removal efficiency of monovalent salt in PDO zymotic fluids, PDO zymotic fluid desalinating process requirements can not be met.Alcohol precipitation The desalination that method is used for PDO zymotic fluids equally exists the shortcomings of salt rejection rate is low, and ethanol consumption is big, high energy consumption.

My company initiates the desalination of technology electrodialysis desalination technology progress PDO zymotic fluids using Tsing-Hua University（Wang Xiaolin, Gong The such as swallow, Tang Yu electrodialysis is used for desalinating process [P] Chinese patents of 1,3-PD zymotic fluid：031048714.2003-2- 21；Lei Yueyong, Luo Jian, Yang De China heterophase ion-exchange membranes are in the electric dialysis desalinating process of 1,3-PD zymotic fluid [P] Chinese patents：2008100566299. 2008-1-23）.However, electrodialytic salt rejection rate is 90-95%, therefore electric osmose After analysing desalination, still there is 0.1-0.3% salt in zymotic fluid, be dehydrated by multiple-effect evaporation, salt content increases in PDO concentrates 0.4%-1.8%, PDO concentrate need to carry out secondary desalination removal of impurities, and boiling again occur in purification process is subsequently slightly evaporated in PDO concentrates The problems such as device fouling, heat transfer efficiency decline.Inventor is directed to this phenomenon, it is proposed that electrodialysis, thick evaporate are combined with scraper plate evaporation Formula desalination impurity-removing method, take full advantage of scraper evaporator suitable for high viscosity, saliferous organic matter evaporation the characteristics of, improve and Perfect traditional PDO zymotic fluids electric dialysis desalinating process, solves and remains in salt fouling in topping still in PDO concentrates, lead The problems such as causing equipment capacity to decline, favourable guarantee is provided for PDO continuous and stable productions.

The content of the invention

Thus, the utility model provide a kind of equipment with high desalinization, in high yield, the fermentation of the 1,3-PD of continuous and steady operation Liquid desalination impurity removed system：

A kind of system of 1,3-PD zymotic fluid desalination removal of impurities, the system include：Electrodialysis desalination device, multiple-effect are steamed Transmitting apparatus, thick distillation unit, scraper evaporator；Electrodialysis desalination device, it is used for the first time desalination of membrane filtration filtrate, abjection 90-95% salt in PDO zymotic fluids；Multi-effect evaporating device, it is connected with the electrodialysis plant, for the electrodialysis The dehydration by evaporation of the first desalinization liquor obtained in device, the water in the first desalinization liquor is removed to water content 25-50%；Slightly evaporate dress Put, it is connected with the multi-effect evaporating device, and thick for PDO concentrates evaporates purification, by the major part in PDO concentrates PDO distills；Scraper evaporator, it is connected with the thick distillation unit, the secondary desalination for PDO materials.

Tthe utility model system production method comprises the following steps：

1）PDO membrane filtrations filtrate after the degerming removing protein of ceramic membrane filter removes 90~95% salt using electrodialysis, The electrical conductivity of PDO materials is reduced to below 2000 μ s/cm after electrodialysis desalination；

2）To step 1）In obtained the first desalinization liquor be dehydrated using multiple-effect evaporation, the water content in the first desalinization liquor is dropped As little as 25~50%；

3）Using the topping still for having 2~5 blocks of column plates by step 2）In the obtained PDO concentrates of water content 25~50% enter Row distilation, the BDO in PDO concentrates, water, most of PDO, a small amount of glycerine are evaporated from tower top to obtain thick distillate, PDO is dense Salt, residual protein, small part PDO, most glycerine in contracting liquid are continuously discharged from tower reactor, are slightly evaporated bottoms；

4）By step 3）What is obtained slightly evaporates bottoms（Salt, residual protein and glycerine）Scrape the secondary desalination of evaporation, PDO and Glycerine is evaporated in scraper evaporator, and with step 3）In thick distillate mixing composition the second desalinization liquor, salt, residual protein and Partial glycerol is continuously discharged from scraper evaporator heavy constituent discharge nozzle, is delivered to sewage disposal system and is focused on.

Brief description of the drawings

Fig. 1 is the structural representation of Tthe utility model system.

Wherein：1 is electrodialysis desalination device；2 be multi-effect evaporating device；3 be thick distillation unit；4 be scraper evaporator.

Embodiment

The utility model is described in detail with reference to embodiment.

A kind of PDO zymotic fluids desalination impurity removed system, as shown in Figure 1.According to embodiment of the present utility model, PDO fermentations Liquid desalination impurity removed system includes：

Electrodialysis desalination device 1：

The electrodialysis desalination device 1 is used to the filtrate carrying out electrodialysis desalination, removes wherein 90-95% salt, with Just the first desalinization liquor is obtained.

Multi-effect evaporating device 2：

The multi-effect evaporating device 2 is connected with the electrodialysis desalination device 1, for first desalinization liquor to be steamed Hair dehydration, to obtain PDO concentrates.Thus, the first desalinization liquor is concentrated, improves PDO concentration.

According to a particular embodiment of the invention, the water content of the PDO concentrates is 25-50%.

Topping still device 3：

The thick distillation unit 3 is connected with the multi-effect evaporator 2, for the PDO concentrates to be carried out slightly to evaporate purification, with Obtain thick distillate.Therefore, PDO concentrates are slightly evaporated, obtains the thick distillates of salt-free PDO and slightly evaporate bottoms.

Scraper evaporator 4：

The scraper evaporator 4 is connected with the thick distillation unit 3, and the PDO and partial glycerol for will slightly evaporate in bottom steam Hair is collected, while removes salt therein, to obtain scraper plate cut.Thus, further evaporated, obtained to slightly evaporating bottoms Scraper plate cut, scraper plate cut mix with thick distillate, form the second desalinization liquor.

Below with reference to specific embodiment, the utility model is illustrated, it is necessary to which explanation is, these embodiments are only It is illustrative, and be not considered as limiting the invention.

Embodiment

Use using glycerine as the fermented obtained PDO zymotic fluids of carbon source, through membrane filtration is degerming, the filtrate after removing protein is original Material carries out desalination removal of impurities, comprises the following steps that：

（1）By salt of the filtrate through electrodialysis desalination removing wherein 93%, the first desalinization liquor, the conductance of the first desalinization liquor are obtained The μ s/cm of rate 1900.

（2）By the first desalinization liquor through multi-effect evaporator thickening, PDO concentrates are obtained after dehydration, PDO concentrates are aqueous Measure as 35%.

（3）PDO concentrates are evaporated through topping still and purified, tower top is evaporated to obtain thick distillate, and tower reactor is slightly evaporated bottoms. PDO concentrates are slightly evaporated in evaporation process, and 92% PDO evaporates into thick distillate in PDO concentrates.

（4）The thick bottoms that evaporates is evaporated into removal of impurities through scraper evaporator, scraper plate cut, base of evaporator are obtained at the top of evaporator Obtain heavy constituent.The thick PDO evaporated in bottoms all evaporates into scraper plate cut, and PDO is free of in scraper plate heavy constituent.Thick distillate and Scraper plate cut mixing the second desalinization liquor of composition, the electrical conductivity of the second desalinization liquor be 109.4 μ s/cm, the second desalinization liquor into rectifying, The downstream separation techniques such as decolouring.

The material composition analysis result of each step is as shown in table 1.

The material composition analysis result of table 1

Above example is only to illustrate, and unrestricted the technical solution of the utility model, although with reference to above-described embodiment The present invention is described in detail, it will be understood by those within the art that：The present invention can still be modified Or equivalent substitution, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover in this hair Among bright right.

Claims (1)

1. a kind of 1,3-PD zymotic fluid desalination impurity removed system, it is characterised in that the system includes：Electrodialysis desalination device, Multi-effect evaporating device, thick distillation unit, scraper evaporator；

Described electrodialysis plant is connected with multi-effect evaporating device；

Described multi-effect evaporating device is connected with thick distillation unit；

Described thick distillation unit is connected with scraper evaporator.