阅读说明：本技术 一种处理衣康酸母液回收衣康酸的方法 (Method for treating itaconic acid mother liquor and recovering itaconic acid ) 是由 朱兆友 李慧媛 崔培哲 王英龙 李鑫 孟凡庆 于 2020-07-31 设计创作，主要内容包括：本发明涉及一种处理衣康酸母液回收衣康酸的方法以及适用于该方法的装置。该方法利用乙酸乙酯作为萃取剂,衣康酸母液与萃取剂乙酸乙酯进入萃取塔中进行萃取分离,萃取液进入汽提塔分离,在汽提塔顶部经过冷凝器回收得到萃取剂,萃取塔底部的衣康酸和水经过结晶器和分离机得到衣康酸,水相循环回萃取塔。该方法具有能耗低,工艺简单,萃取效率较高,所采用的萃取剂乙酸乙酯经济且易于回收。(The invention relates to a method for treating itaconic acid mother liquor to recover itaconic acid and a device suitable for the method. According to the method, ethyl acetate is used as an extracting agent, itaconic acid mother liquor and the extracting agent ethyl acetate enter an extracting tower for extraction and separation, extract liquid enters a stripping tower for separation, the extracting agent is obtained by recycling the top of the stripping tower through a condenser, itaconic acid and water at the bottom of the extracting tower are obtained by passing through a crystallizer and a separator, and a water phase is recycled to the extracting tower. The method has the advantages of low energy consumption, simple process, high extraction efficiency, and economic and easy recovery of the adopted extractant ethyl acetate.)

1. A method for treating itaconic acid mother liquor to recover itaconic acid is characterized in that a device for realizing the method mainly comprises the following parts: an extraction tower (T1), a stripping tower (T2), a crystallizer (M1), a condenser (C1), a centrifuge (L1) and a pump (P1); wherein the top of the extraction tower (T1) is connected with a stripping tower (T2), the top of the stripping tower (T2) is connected with a condenser (C1) to recover an extracting agent, the bottom of the stripping tower (T2) is sequentially connected with a crystallizer (M1) and a centrifuge (L1), the water phase of the centrifuge (L1) is circulated back to the extraction tower (T1) through a pump (P1),

the method for treating the itaconic acid mother liquor and recycling the itaconic acid by adopting the device comprises the following steps:

(1) the itaconic acid mother liquor enters from the top of an extraction tower (T1), the extractant enters from the bottom of the extraction tower (T1), after effective contact extraction separation, a raffinate phase and extractant mixture is discharged from the bottom of the extraction tower (T1), an extract phase itaconic acid and extractant mixture enters into a stripping tower (T2) from the top of the extraction tower (T1),

(2) after the itaconic acid mother liquor is separated by a stripping tower (T2), an extractant enters a condenser (C1) from the top to be recovered, water and itaconic acid enter a crystallizer (M1) from the bottom of the tower, the water and the itaconic acid enter a centrifuge (L1) after being crystallized to separate the itaconic acid, a water phase is recovered to an extraction tower (T1) by a pump (P1) to be recycled,

the extraction agent is ethyl acetate, the operating pressure of the extraction tower (T1) is 1atm, the number of tower plates is 5-10, the pressure of the stripping tower (T2) is 1atm, the number of tower plates is 9-18, and the recovery rate of itaconic acid in the itaconic acid mother liquor is higher than 92.7%.

[ technical field ] A method for producing a semiconductor device

The invention belongs to the field of chemical separation and purification, particularly relates to a method for treating itaconic acid mother liquor and recovering itaconic acid, and further relates to a method for separating itaconic acid from itaconic acid mother liquor by extraction, distillation and crystallization methods by taking an organic solvent as an extracting agent.

[ background of the invention ]

The prior industrial production methods of itaconic acid comprise a chemical synthesis method and a fermentation method. Compared with the chemical synthesis method, the fermentation method has more advantages, and most of itaconic acid is produced internationally by the fermentation method, but the fermentation method has the defects of simple process equipment, less investment, fast operation, simple operation technology, low energy consumption, extensive raw materials and the like, and itaconic acid in the fermentation liquid is difficult to extract. At present, the method for separating and extracting itaconic acid from fermentation liquor is a recrystallization method, but a large amount of waste liquor is generated in the separation process, so that on one hand, the loss of enterprises is great, and on the other hand, the environmental protection treatment is difficult due to the mother liquor with the CODcr as high as 60-80 ten thousand mg/L.

The itaconic acid fermentation waste liquid is fermentation industrial waste water which is extremely difficult to treat and has the advantages of suspended matters, more solid matters, large viscosity, low pH value and deep chroma, and an effective treatment method for the waste liquid is not available at present. In order to improve the recovery rate of the itaconic acid, a scheme for recovering the itaconic acid from the fermentation waste liquid by an extraction method is discussed.

Chinese patent CN201210303823.2 discloses a method for extracting itaconic acid from itaconic acid fermentation broth, wherein the extraction rate of itaconic acid is 89%.

Chinese patent 20071019534.5 discloses a method for extracting itaconic acid from itaconic acid fermentation broth or itaconic acid product mother liquor, which adopts high performance liquid chromatography to extract itaconic acid, but needs to prepare synthetic resin, and the process is complex.

The existing method for extracting itaconic acid from fermentation mother liquor has the problems of resource waste, low removal rate, complex process and the like.

The method combines extraction, distillation and crystallization to separate itaconic acid from itaconic acid mother liquor, takes ethyl acetate as an extracting agent, can save a large amount of acid and alkali loss, has short process flow in comparison, and is an ideal extraction method.

[ summary of the invention ]

[ problem to be solved ]

The invention aims to provide a device for treating itaconic acid mother liquor and recovering itaconic acid.

It is another object of the present invention to provide a process for treating a mother liquor of itaconic acid fermentation and recovering itaconic acid using said apparatus.

It is another object of the present invention to provide the use of an organic solvent as an extractant in the recovery of itaconic acid in a fermentation mother liquor.

[ solution ]

The invention is realized by the following technical scheme.

A method for treating itaconic acid mother liquor to recover itaconic acid is characterized in that a device for realizing the method mainly comprises the following parts: an extraction tower (T1), a stripping tower (T2), a crystallizer (M1), a condenser (C1), a centrifuge (L1) and a pump (P1); wherein the top of the extraction tower (T1) is connected with a stripping tower (T2), the top of the stripping tower (T2) is connected with a condenser (C1) to recover an extracting agent, the bottom of the stripping tower (T2) is sequentially connected with a crystallizer (M1) and a centrifuge (L1), and the water phase of the centrifuge (L1) is circulated back to the extraction tower (T1) through a pump (P1).

The method for treating the itaconic acid mother liquor and recycling the itaconic acid by adopting the device comprises the following steps:

(1) the itaconic acid mother liquor enters from the top of an extraction tower (T1), the extractant enters from the bottom of the extraction tower (T1), after effective contact extraction and separation, a raffinate phase and extractant mixture is discharged from the bottom of the extraction tower (T1), and an extract phase itaconic acid and extractant mixture enters a stripping tower (T2) from the top of the extraction tower (T1);

(2) after the itaconic acid mother liquor is separated by a stripping tower (T2), an extractant enters a condenser (C1) from the top to be recovered, water and itaconic acid enter a crystallizer (M1) from the bottom of the tower, the water and the itaconic acid enter a centrifuge (L1) to be centrifuged to separate the itaconic acid, and a water phase is recovered to an extraction tower (T1) to be recycled by a pump (P1).

The extraction agent is ethyl acetate, the operating pressure of the extraction tower (T1) is 1atm, the number of tower plates is 5-10, the pressure of the stripping tower (T2) is 1atm, the number of tower plates is 9-18, and the recovery rate of itaconic acid in the itaconic acid mother liquor is higher than 92.7%.

[ advantageous effects ]

Compared with the prior art, the invention mainly has the following beneficial effects:

(1) the method for extracting the itaconic acid can obtain the itaconic acid with good extraction effect, and solves the problem of difficult extraction of the itaconic acid from the fermentation mother liquor.

(2) The method has the advantages of simple process, less investment equipment, high extraction rate in the process and the like, and the adopted extractant, namely the ethyl acetate, is low in economic pollution.

(3) The extraction agent ethyl acetate adopted in the method is easy to recover, the loss of the extraction agent is reduced, and the separation cost is reduced.

[ description of the drawings ]

FIG. 1 is a flow diagram of a process for treating itaconic acid mother liquor to recover itaconic acid in accordance with the present invention.

In the figure, T1-extraction column; t2-stripper column; c1-condenser; m1-crystallizer; l1-separator; p1-pump; the extractant and itaconic acid mother liquor feeds are labeled in the figure.

[ detailed description ] embodiments