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Method for harmless resourceful treatment of BDO organic waste liquid

A technology of organic waste liquid and recycling, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of unstable quality of BDO finished products, ineffective use of resources, high production costs and energy consumption, etc. Achieve good control, not easy to change color, high production efficiency

Pending Publication Date: 2020-10-30
迪邦(泸州)化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the organic waste liquid produced by the production of 1,4-butanediol, the content of recyclable alcohol chemical raw materials is as high as 50%. Most of the current treatment methods are incineration, which not only pollutes the environment, but also cannot be recycled. The active ingredients in it cause a waste of resources, and each ton of organic waste liquid requires a treatment fee of about 200-500 yuan
[0004] Aiming at the problem that a large amount of BDO organic waste liquid is difficult to separate in the distillation tower and the resources cannot be effectively utilized, the patent applicant Dibang (Luzhou) Chemical Co., Ltd. applied for a patent in 2014 "a harmless treatment of BDO organic Waste liquid method" (CN104262097A), this method carries out dealcohol treatment according to the method of patent ZL201010568080.2, and obtains n-butanol product, rectification column overhead distillate and water-rich layer, and the water-rich layer is according to patent ZL201010568079.X In the later stage, the salt-containing substances need to be burned; the invention patent "A method for harmless treatment of BDO organic waste liquid" (CN201510798850.5) was applied for in 2015. This method first separates BDO and then adds acid Convert salt, add water back to dissolve and separate salt; in 2016, applied for the invention patent "A method for harmless treatment of BDO organic waste liquid" (CN106349018A), this method firstly obtains alcohol products and sodium nitrate by treating BDO organic waste liquid Finally, the BDO product is obtained by separation; the above three patents all have the problems of complex process, high production cost and energy consumption, unstable quality of BDO finished product, and discoloration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Throw 4 tons of BDO organic waste liquid and add 40% nitric acid into the refining tank, adjust the pH value to 4, heat up to 60°C, and adjust the reflux ratio to 1:1 under normal pressure. The low boilers of methanol, propanol, and propargyl alcohol are stored in the low boiler storage tank; after the low boilers are separated, the remaining bottom liquid is rectified to separate water, and the refining tank continues to heat up to 110°C, and then it is turned on. Vacuum pump with a vacuum degree of -0.07MPa, and a reflux ratio of 1:2 to separate water. As the water output decreases, gradually adjust the reflux ratio to 2:1 to continue separating water.

[0028] (2) After the separation of water is completed, the temperature of the refining tank continues to rise to 125°C, the vacuum degree is -0.075MPa, the pH value is 4, and the reflux ratio is adjusted to 5:1 to separate 1,4-butanediol (BDO). When the BDO content reaches more than 95%, it is collected and put in...

Embodiment 2

[0035] (1) Throw 4 tons of BDO organic waste liquid and add 30% sulfuric acid into the refining tank, adjust the pH value to 3, heat up to 99°C, and adjust the reflux ratio to 5:1 under normal pressure. The low boilers of methanol, propanol, and propargyl alcohol are stored in the low boiler storage tank; after the low boilers are separated, the remaining bottom liquid is rectified to separate water, and the refining tank continues to heat up to 119°C, and then it is turned on. Vacuum pump with a vacuum degree of -0.07MPa, and a reflux ratio of 1:2 to separate water. As the water output decreases, gradually adjust the reflux ratio to 2:1 to continue separating water.

[0036] (2) After the separation of water is completed, the temperature of the refining tank continues to rise to 120°C, the vacuum degree is -0.070MPa, the pH value is 6, the reflux ratio is 5:1, and 1,4-butanediol (BDO) is separated. When the BDO content reaches more than 95%, it is collected and put into the B...

Embodiment 3

[0043] (1) Throw 4 tons of BDO organic waste liquid and add 50% phosphoric acid into the refining tank, adjust the pH value to 5, heat up to 95°C, and adjust the reflux ratio to 2:1 under normal pressure. During the process, the separating process includes butanol, The low boilers of methanol, propanol, and propargyl alcohol are stored in the low boiler storage tank; after the low boilers are separated, the remaining bottom liquid is rectified to separate water, and the refining tank continues to heat up to 115°C and opened Vacuum pump with a vacuum degree of -0.07MPa, and a reflux ratio of 1:2 to separate water. As the water output decreases, gradually adjust the reflux ratio to 2:1 to continue separating water.

[0044](2) After the separation of water is completed, the temperature of the refining tank continues to rise to 130°C, the vacuum degree is -0.071MPa, the pH value is 3.5, the reflux ratio is 5:1, and 1,4-butanediol (BDO) is separated. When the BDO content reaches m...

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Abstract

The invention discloses a method for harmless resourceful treatment of BDO organic waste liquid. The method comprises the following steps of: adding acid into the BDO organic waste liquid, performingdistilling to separate out rectified substances containing low-boiling-point substances, water, 1, 4-butanediol and high-boiling-point substances, and separating out salt and high-molecular alcohols from the residual waste liquid by a solid-liquid separation method. The method is simple in process and easy to operate, the product is high in purity and stable in quality and color, 100% harmless treatment of the BDO organic waste liquid is achieved, the production cost and energy consumption are reduced, energy conservation and emission reduction are facilitated, and the method has great environmental benefits, economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the field of waste liquid treatment, and in particular relates to a method for harmless and resourceful treatment of BDO organic waste liquid. Background technique [0002] 1,4-Butanediol, also known as BDO, is an important organic and fine chemical raw material, which is widely used in the fields of medicine, chemical industry, textile, papermaking, automobile and daily chemical industry. BDO can produce tetrahydrofuran (THF), polybutylene terephthalate (PBT), γ-butyrolactone (GBL) and polyurethane resin (PU Resin), coatings and plasticizers, as well as solvents and electroplating Brighteners in the industry, etc. [0003] In the process of producing BDO, a large amount of high-concentration organic waste liquid will be produced, which contains 1,4-butanediol, BuOH (butanol), methanol, propanol, propargyl alcohol, butynediol, water and Sodium salt (sodium formate, sodium hydroxide), etc. The BDO organic waste liquid is easy...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/74C07C29/88C01D9/04
CPCC07C29/74C07C29/88C01D9/04C07C31/207
Inventor 杨泽江杨国权夏锡兰肖勇陈羽颜泽清
Owner 迪邦(泸州)化工有限公司
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