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Treatment method for wastewater in cellulose ether production

A cellulose ether and treatment method technology, applied in multi-stage water treatment, water/sewage treatment, natural water treatment and other directions, can solve the problem of high energy consumption, achieve the effects of load reduction, effective disposal and good economic benefits

Inactive Publication Date: 2017-02-08
浙江合众环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this process is that there is no recovery of solvent and cellulose ether, and incineration will produce secondary pollution and high energy consumption.

Method used

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  • Treatment method for wastewater in cellulose ether production

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Experimental program
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Effect test

Embodiment

[0028] Take 5000ml of cellulose ether wastewater, add 200mg / L PAC agent, use the experimental pressurized dissolved air flotation or sedimentation method to remove SS, the waste residue is solid waste, the clear liquid is collected under the negative pressure of -0.05MPa, 75-70 About 100ml of condensed water with a boiling range of ℃, this condensed water is a mixed aqueous solution of toluene and isopropanol, which is reused in the workshop. The residual water after vacuum distillation enters the MVR for evaporation. The COD of the condensed water evaporated by the MVR is about 3000-6000mg / L, the BOD is about 1000-3000mg / L, the salinity is about 300mg / L, and the total is about 4000ml. Waste water enters the A / O biochemical tank for treatment and discharges after reaching the standard; after evaporation, 200g of crude sodium chloride salt is obtained, which needs further treatment; the evaporated mother liquor is put into the aging tank, after about 6 hours of aging, the precipi...

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Abstract

The invention discloses a treatment method for wastewater in cellulose ether production. The method includes: air flotation, reduced pressure distillation, crystallization, countercurrent washing, dissolving, aging filtering and evaporation concentration recrystallization, thus obtaining sodium chloride refined salt. The method provided by the invention recovers most toluene and isopropanol solvent, does not generate secondary pollution, produces environmental protection and economic benefits, after recovery, the COD load of condensate water subjected to MVR evaporation is greatly reduced, the concentrated sodium chloride coarse crystals are subjected to washing and recrystallization, thus obtaining industrial refined salt sodium chloride, which can be reused in ionic membrane sodium hydroxide process, the concentrated mother liquor can be returned to the workshop, while the wastewater is disposed effectively, good economic benefits are also produced.

Description

Technical field [0001] The invention belongs to the field of environmental protection water treatment, and particularly relates to a cellulose ether wastewater treatment method. Background technique [0002] Cellulose ether is a high molecular compound with ether structure made of cellulose. Cellulose is a polyhydroxy polymer compound that neither dissolves nor melts. After etherification, cellulose can be dissolved in water, dilute alkali solutions and organic solvents, and has thermoplasticity. After etherification, the solubility of cellulose has changed significantly. It can be dissolved in water, dilute acid, dilute alkali or organic solvent. The solubility mainly depends on three factors: (1) The characteristics of the groups introduced during the etherification process, the introduction The larger the group, the lower the solubility, the stronger the polarity of the introduced group, and the easier the cellulose ether is to dissolve in water; (2) the degree of substitutio...

Claims

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Application Information

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IPC IPC(8): C02F9/14C01D3/04C02F103/38
CPCC02F9/00C01D3/04C02F1/04C02F1/041C02F1/24C02F3/30C02F2001/007C02F2001/5218C02F2103/38C02F2209/08C02F2301/046C02F2301/08
Inventor 黄伟农费凡费雄略任海博蔡樱英俞俐珍王贤斌
Owner 浙江合众环保科技有限公司