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Method for extracting ammonium sulfate from synthetic mother liquor containing phenol

A technology for synthesizing mother liquor and ammonium sulfate, applied in ammonium sulfate and other directions, can solve problems such as poor quality of ammonium sulfate, and achieve the effect of simple operation and high quality

Inactive Publication Date: 2011-05-18
HENAN NEWLAND PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is exactly the shortcoming that the ammonium sulfate that the existing purification method obtains is poor in quality, provides a kind of simple and easy operation, the method for extracting ammonium sulfate from the synthetic mother liquor containing phenol with higher product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1. Add phenol-containing synthetic mother liquor with a volume of 3000L into a 5000L hot kettle, turn on steam, concentrate at normal pressure, and concentrate to 2700L. The density of the mixed acid synthetic mother liquor is 1.2g / cm3 at 80°C 3 , this kind of mother liquor is called the first concentrated mother liquor;

[0016] 2. Transfer the first concentrated mother liquor obtained in the above step 1 to a cold kettle to cool down to 40°C, add 2700L of methanol, stir for 1 hour, filter, wash the filter cake with methanol, and dry it to obtain ammonium sulfate. The filtrate weighs It is used as a mother liquor for later use;

[0017] 3. Put the primary mother liquor obtained in the above step 2 into a hot kettle at 70° C. and turn on the steam to reduce the pressure to vacuum and concentrate, distill out methanol until there is no liquid flow, and can be reused.

Embodiment 2

[0019] 1. Add phenol-containing synthetic mother liquor with a volume of 3000L into a 5000L hot kettle, turn on steam, concentrate at normal pressure, and concentrate to 2700L. The density of the mixed acid synthetic mother liquor is 1.2g / cm3 at 80°C 3 , this kind of mother liquor is called the first concentrated mother liquor;

[0020] 2. Transfer the first concentrated mother liquor obtained in the above step 1 to a cold kettle to cool down to 20°C, add 2700L methanol, stir for 2 hours, filter, wash the filter cake with methanol, and dry it to obtain ammonium sulfate. The filtrate weighs It is used as a mother liquor for later use;

[0021] 3. Put the primary mother liquor obtained in the above step 2 into a hot kettle at 80° C. and turn on the steam to depressurize to 0.9 Mpa. Concentrate and distill methanol until there is no liquid flow, which can be reused.

Embodiment 3

[0023] 1. Add phenol-containing synthetic mother liquor with a volume of 3000L into a 5000L hot kettle, turn on steam, concentrate at normal pressure, and concentrate to 2700L. The density of the mixed acid synthetic mother liquor is 1.2g / cm3 at 80°C 3 , this kind of mother liquor is called the first concentrated mother liquor;

[0024] 2. Transfer the first concentrated mother liquor obtained in the above step 1 to a cold kettle to cool down to 30°C, add 2700L methanol, stir for 1.5 hours, filter, wash the filter cake with methanol, and dry it to obtain ammonium sulfate. The filtrate weighs It is used as a mother liquor for later use;

[0025] 3. Put the primary mother liquor obtained in the above step 2 into a hot kettle at 75° C. and turn on the steam to depressurize to 0.06 Mpa. Concentrate and distill methanol until there is no liquid flow, which can be reused.

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Abstract

The invention belongs to the technical field of waste water treatment, in particular to a method for extracting ammonium sulfate from mixed mother liquor containing the ammonium sulfate, phenol and p-hydroxyphenylglycine. The method comprises the following steps: 1, adding the synthetic mother liquor containing the phenol to a heating kettle, and concentrating the mother liquor with steam under normal pressure; 2, transferring the concentrated mother liquor for the first time obtained in step 1 to a cooling kettle for cooling, adding methanol, stirring and filtering, soaking and washing the obtained filter cake with the methanol, and then drying to obtain the ammonium sulfate; and 3, placing the primary filtrate obtained in step 2 in the heating kettle, depressurizing and concentrating the filtrate with steam until the methanol is distilled out until no liquid flows, and reusing the methanol in step 2. The method provided by the invention is simple in operation, and the obtained ammonium sulfate has high quality, thus the method is very applicable to purifying the ammonium sulfate in the mixed mother liquor containing the phenol and the ammonium sulfate.

Description

technical field [0001] The technical field to which the invention belongs is the field of waste water treatment, in particular to a method for extracting ammonium sulfate from a mixed mother liquor containing ammonium sulfate, phenol and p-hydroxyphenylglycine. Background technique [0002] The synthesis mother liquor of p-hydroxyphenylglycine contains a large amount of by-products ammonium sulfate, phenol, p-hydroxyphenylglycine and other substances, which is called "phenol-containing synthesis mother liquor", because this mother liquor contains a large amount of phenol and ammonium sulfate, etc. Substances, direct discharge leads to higher COD content in wastewater, causing environmental pollution; and because of impurities such as p-hydroxyphenylglycine and phenol, it affects the purity of purified ammonium sulfate; existing treatment technologies mostly use distillation to synthesize phenol-containing mother liquor. Purification, the quality of the ammonium sulfate extra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/24
Inventor 谢建中张芦苇刘万民
Owner HENAN NEWLAND PHARMA
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