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Resource utilization method of printing and dyeing white mud

A technology of resource utilization and lime mud, applied in organic chemistry, separation/purification of carboxylic acid compounds, etc., can solve problems such as difficulty in large-scale production, high production consumption, and low product quality

Inactive Publication Date: 2017-09-22
绍兴汉青环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For many years, there have been attempts to extract terephthalic acid from it, but it has been difficult to produce on a large scale due to poor product quality or high production consumption

Method used

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  • Resource utilization method of printing and dyeing white mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment proceeds in the following five steps:

[0020] The first step is water beating. The raw material is printing and dyeing lime mud waste. Analysis shows that the waste contains 50.2wt% terephthalic acid. Add 150°C high-temperature water to the printing and dyeing lime mud. The mass ratio of lime mud to water is 1:6. Stir and beat, the stirring residence time is 2.0h, and then filter to obtain a filter cake;

[0021] Step 2, dissolve at high temperature, add solvent dimethyl sulfoxide to the filter cake obtained in step 1, the mass ratio of filter cake to solvent is 1:2.0, stir well to form a slurry, raise the temperature to 160°C to make the filter cake close to Complete dissolution, residence time 0.5h;

[0022] Step 3, filtering, filtering the material obtained in step 2, the filtration accuracy of the filter is 0.5-5 μm filter, to obtain the filtrate;

[0023] Step 4, cooling and crystallization, the filtrate obtained in step 3 is cooled and lowered t...

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PUM

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Abstract

The invention discloses a printing and dyeing white mud resource utilizing method. A white terephthalic acid product is obtained through high-temperature water pulping, high-temperature solvent dissolving, high-temperature filtering, cooling, crystallizing, filtering and drying, and the purity of the obtained terephthalic acid product reaches 99.8% or higher, the industrial fine terephthalic acid level is reached, and indexes such as the transmittance and acid value of the product are all equivalent to those of industrial fine terephthalic acid.

Description

technical field [0001] The invention belongs to the field of waste treatment in printing and dyeing factories, and in particular relates to a method for recycling white mud waste in printing and dyeing. Background technique [0002] Printing and dyeing white mud is the waste fished out from the sewage tank of the printing and dyeing factory. It is grayish yellow and has a sour taste. Printing and dyeing white mud is basically solid waste at present. Some fireworks and firecracker factories use it as a filler for fireworks and firecrackers after purchasing it at a very low price, but this may face environmental pressure; or paint coatings etc. Over the years, attempts have been made to extract terephthalic acid, but it has been difficult to produce on a large scale because of poor product quality or high production costs. Contents of the invention [0003] In view of the relatively high content of terephthalic acid in printing and dyeing white mud, the object of the prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/42C07C63/26
CPCC07C51/42C07C63/26
Inventor 谢刚王献忠徐海波
Owner 绍兴汉青环保科技有限公司