Method for recycling ethoxyacetic acid from sodium carboxymethylcellulose industrial wastewater

A technology of sodium carboxymethylcellulose and ethoxyacetic acid, which is applied in the separation/purification of carboxylic acid compounds, preparation of carboxylate salts, chemical instruments and methods, etc., can solve the problems of less reporting and achieve recycling and reuse , low cost and easy operation

Active Publication Date: 2014-11-12
SHANGHAI UNIV OF ENG SCI +1
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Problems solved by technology

However, it is found through literature research that the method of recovering etho...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Accurately pipette 200ml of sodium carboxymethylcellulose production wastewater, adjust the pH value of the wastewater to 12.0 with sodium hydroxide, and then distill the wastewater to remove ethanol and water in the wastewater at a pressure of 1KPa and a temperature of 70°C; use 30ml of the obtained white solid Mass percent concentration is 37% concentrated hydrochloric acid rinsing, and the hydrochloric acid solution that rinsing gets off is extracted 3 times with ethyl acetate, uses 120ml ethyl acetate each time; Collect the ethyl acetate organic phase after extraction, under 1KPa pressure, temperature Ethoxyacetic acid product is obtained by distillation at 50°C.

Embodiment 2

[0016] Accurately pipette 200ml of sodium carboxymethylcellulose production wastewater, adjust the pH value of the wastewater to 11.0 with sodium hydroxide, and then distill the wastewater to remove ethanol and water in the wastewater at a pressure of 1KPa and a temperature of 60°C; use 30ml of the obtained white solid Mass percent concentration is 36% concentrated hydrochloric acid rinsing, and the hydrochloric acid solution that rinsing comes off is extracted 3 times with butyl acetate, uses 200ml butyl acetate each time; Collect the butyl acetate organic phase after extraction, under 1KPa pressure, temperature Ethoxyacetic acid product is obtained by distillation at 60°C.

Embodiment 3

[0018] Accurately pipette 200ml of sodium carboxymethylcellulose production wastewater, adjust the pH value of the wastewater to 11.5 with sodium hydroxide, then distill the wastewater at a pressure of 1KPa and a temperature of 50°C to remove ethanol and water in the wastewater; use 30ml of white solid Concentrated hydrochloric acid with a mass percentage concentration of 38% is rinsed, and the rinsed hydrochloric acid solution is extracted with ether three times, using 150ml of ether each time; the extracted ether organic phase is collected and distilled at a pressure of 1KPa and a temperature of 70°C to obtain Ethoxyacetic acid products.

[0019] The product identification results are as follows:

[0020] 1 HNMR (CDCl 3 , δ / ppm): 1.25-1.3 (t, 3H), 3.6-3.65 (q, 2H), 4.13 (s, 2H), 8.1-8.2 (br, 1H).

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Abstract

A method for recycling ethoxyacetic acid from sodium carboxymethylcellulose industrial wastewater comprises the following steps that (1), the pH value of the sodium carboxymethylcellulose industrial wastewater is adjusted to 11.0-12.0, and then the wastewater is subjected to decompression and distillation to obtain a white solid; (2) the white solid obtained in the step (1) is eluted by concentrated hydrochloric acid, the obtained hydrochloric acid solution is extracted for 3 times by an organic solvent, and organic phases are separated out for standby application; (3), the organic phases obtained in the step (2) are subjected to decompression and distillation to obtain ethoxyacetic acid products. According to the method for recycling the ethoxyacetic acid from the sodium carboxymethylcellulose industrial wastewater, operation is convenient, the cost is low, and recycling and reusing of resources are achieved.

Description

technical field [0001] The invention relates to a method for recovering chemical products from chemical waste water, in particular to a method for recovering ethoxyacetic acid from waste water produced by sodium carboxymethyl cellulose. Background technique [0002] Carboxymethyl cellulose and its sodium salt are a class of stabilizers widely used in petroleum and food industries. Due to the existence of side reactions in the synthesis process of sodium carboxymethyl cellulose, the production wastewater contains a large amount of organic and inorganic by-products. Among them, ethoxyacetic acid is a major by-product. However, it is found through literature research that the method of recovering ethoxyacetic acid from the waste water produced by sodium carboxymethyl cellulose is rarely reported. Contents of the invention [0003] Purpose of the present invention, just in order to solve the problems referred to above, a kind of method of reclaiming ethoxyacetic acid from so...

Claims

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Application Information

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IPC IPC(8): C07C51/42C07C51/48C07C59/125C02F9/10
CPCC07C51/02C07C51/42C07C59/125
Inventor 饶品华万志钢朱宏彬张文启倪志青
Owner SHANGHAI UNIV OF ENG SCI
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