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Reusable method of decanedioic acid phenol-containing wastewater

A technology for sebacic acid and phenol wastewater, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., and can solve problems such as poor quality of sebacic acid finished products, resin pollution, and environmental pollution

Inactive Publication Date: 2009-11-11
上海芝东商务咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that decolorization resin needs to be used, and the pollution is still relatively serious when the resin is recovered.
However, the disadvantage of this method is that resin must still be used, and the pollution in the recovery of resin is still relatively serious.
However, the disadvantage of this method is that the process is more cumbersome
[0008] A) Large water consumption, waste of resources
[0009] B) A large amount of waste water pollutes the environment
[0010] C) The finished product yield of sebacic acid is low and the cost is high
[0011] D) The finished product of sebacic acid is of poor quality
[0012] Due to the problem of a large amount of waste water generated by the above-mentioned production methods, the production of sebacic acid is currently facing increasing environmental pressure

Method used

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  • Reusable method of decanedioic acid phenol-containing wastewater
  • Reusable method of decanedioic acid phenol-containing wastewater
  • Reusable method of decanedioic acid phenol-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Such as figure 2 As shown in route a, the raw materials of castor oil, zinc oxide and water are hydrolyzed and cracked to obtain a phenol-containing sebacate solution. The sebacic acid salt solution is neutralized, activated carbon is decolorized, acidified and crystallized to obtain the sebacic acid mother liquor. The sebacic acid mother liquor contains about 4% sebacic acid.

[0117] The sebacic acid mother liquor is subjected to solid-liquid filtration to obtain sebacic acid solids and first waste water, and the first waste water is recycled:

[0118] The resulting 60% by weight of the first waste water is recycled for the neutralization step; the first waste water of the remaining 40% of the uncirculated part is neutralized and extracted to remove phenol, and the pervaporation step is used to remove the sodium sulfate by-product to obtain The third wastewater, the third wastewater is reclaimed for subsequent biochemical treatment to obtain the fourth wastewater m...

Embodiment 2

[0137] Such as figure 2 As shown in the route b, the method of Example 2 is with reference to Example 1, the difference is that: the sebacic acid mother liquor layering step is adopted, all the first wastewater and part of the third wastewater are recycled, and neutralization and extraction are used. And total evaporation process the second waste water to obtain the 3rd waste water, specifically as follows:

[0138] Sebacic acid mother liquor stratification ratio: upper layer 50%, lower layer 50%.

[0139] Recycling of the first waste water: recycle 100% of the first waste water to replace part of the added water before the neutralization step;

[0140] Recycling of the third waste water: recycle 60% of the third waste water to replace part of the added water before the neutralization step and the flushing water in the centrifugal filtration step;

[0141] (Note: the above ratios are weight ratios)

[0142] Sodium sulfate Sebacic acid Phenol Glycerin, fatty...

Embodiment 3

[0153] The method of embodiment 3 is with reference to embodiment 2, and difference is: combine with the refining method of sebacic acid. See the process image 3 .

[0154] details as follows:

[0155] Sebacic acid mother liquor stratification ratio: upper layer 50%, lower layer 50%.

[0156] Recycling of the first waste water: recycle 100% of the first waste water to replace part of the added water before the neutralization step;

[0157] Recycling of the third waste water: recycle 60% of the third waste water to replace part of the added water before the neutralization step and the flushing water in the centrifugal filtration step;

[0158] The refining method of sebacic acid is as follows: the semi-finished product of common sebacic acid is distilled, and the distillation includes the step of removing impurities by forward distillation at 195-210 °C and vacuum degree of 2500-5500 Pa, and at 180-200 °C , the sebacic acid distillation step carried out under a vacuum of 8...

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Abstract

The invention provides a reusable method of decanedioic acid phenol-containing wastewater, which comprises the following steps: providing decanedioic acid mother liquid which is prepared by neutralizing and acidating and crystallizing a sebacate solution; carrying out solid-liquid separation to the mother liquid to obtain a decanedioic acid solid and first wastewater, reusing the first wastewater, for example, part of the first wastewater is recycled to be used in a neutralization step; neutralizing and extracting balance of the first wastewater, removing phenol, performing pervaporation and removing by-product which is sodium sulfate to obtain third wastewater that is recycled to be used in the neutralization step or as flushing water in a centrifugal filtration step or is biologically treated to obtain fourth wastewater satisfying the discharge standard; or laminating the decanedioic acid mother liquid to obtain lower layer dope (part A) which contains crystallized decanedioic acid and upper clear solution (part B); carrying out solid-liquid separation to the lower layer dope (part A) which contains crystallized decanedioic acid to obtain the decanedioic acid solid and the first wastewater; carrying out solid-liquid separation to the upper clear solution (part B) to obtain the decanedioic acid solid and second wastewater; and reusing the first wastewater and the second wastewater.

Description

technical field [0001] The invention relates to a compound production process wastewater recycling method and a device thereof, in particular to a phenol-containing process wastewater recycling method and a device in the sebacic acid production process. Background technique [0002] Sebacic acid, English name: Sebacic Acid, aliases: sebacic acid, octane dicarboxylic acid, suberic acid, molecular formula: C 10 h 18 o 4 , its structural formula is: HOOC(CH 2 ) 8 Properties of COOH: White scaly or needle-like crystals. The relative density is 1.207 (25°C), the melting point is 131-134.5°C, the boiling point is 294.5°C (13.3kPa), and the refractive index is 1.442 (133.3°C). The industrial product is white powder or granular, with a slight fatty acid smell. Slightly soluble in water, easily soluble in organic solvents such as ethanol and ether. [0003] At present, sebacic acid, as an increasingly important raw material for organic synthesis, can be used to synthesize diet...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/58C02F1/66C02F1/26C02F1/04C02F101/34
Inventor 吴之东
Owner 上海芝东商务咨询有限公司
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