Pretreatment method and system for wastewater in technology for preparing epoxy chloropropane by propylene high-temperature chlorination process

An epichlorohydrin and high-temperature chlorination technology, applied in the chemical industry, can solve the problems of low efficiency, complicated pretreatment process, and high content of suspended solids in wastewater, and achieve the effects of simple process flow, favorable biochemical treatment, and high treatment efficiency.

Inactive Publication Date: 2018-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Based on this, it is necessary to address the problems of the existing cyclization wastewater pretreatment process complex, low efficiency, and high content of suspended solids in wastewater after treatment, and provide a method with simple process flow, high treatment efficiency, and low suspended solids content in treated wastewater. 50ppm propylene high-temperature chlorination method to prepare wastewater pretreatment method in epichlorohydrin process

Method used

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  • Pretreatment method and system for wastewater in technology for preparing epoxy chloropropane by propylene high-temperature chlorination process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] (1) Obtain the cyclization wastewater in the process of preparing epichlorohydrin by high-temperature chlorination of propylene, the pH value of the cyclization wastewater is 10.9, and the suspended solid content is 2306mg / l.

[0081] (2) Mix the cyclization wastewater with 30% hydrochloric acid to obtain a mixed solution, the pH of which is 8.9.

[0082] (3) Mix the above mixed liquid with 1.2‰ aluminum sulfate aqueous solution, stir and settle to obtain clear liquid and sediment.

[0083] The sediment is centrifuged to obtain lime water and lime residue. Return the lime water to repeat step (3).

[0084] The water quality of the collected supernatant was clear and transparent, and the content of suspended solids in the supernatant was 47 mg / l.

[0085] Lime slag is concentrated and calcined into quicklime for recycling.

Embodiment 2

[0087] (1) Obtain the cyclization wastewater in the process of preparing epichlorohydrin by high-temperature chlorination of propylene, the pH value of the cyclization wastewater is 10.6, and the suspended matter content is 2506 mg / l.

[0088] (2) Mix the cyclization wastewater with 50% sulfuric acid to obtain a mixed solution, the pH of which is 8.7.

[0089] (3) Mix the above mixed liquid with 1.4‰ ferric chloride aqueous solution, stir and settle to obtain clear liquid and sediment.

[0090] The water quality of the collected supernatant was clear and transparent, and the content of suspended solids in the supernatant was 53 mg / l.

Embodiment 3

[0092] (1) Obtain the cyclization wastewater in the process of preparing epichlorohydrin by high-temperature chlorination of propylene, the pH value of the cyclization wastewater is 11.2, and the suspended solid content is 2440 mg / l.

[0093] (2) Mix the cyclization wastewater with 69% nitric acid to obtain a mixed solution, the pH of which is 8.8.

[0094] (3) Mix the above mixed solution with 2.3‰ polysilicate ferric sulfate aqueous solution, stir and settle to obtain clear liquid and sediment.

[0095] The sediment is centrifuged to obtain lime water and lime residue. Return the lime water to repeat step (3).

[0096] The water quality of the collected supernatant was clear and transparent, and the content of suspended solids in the supernatant was 48 mg / l.

[0097] Lime slag is concentrated and calcined into quicklime for recycling.

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Abstract

The invention provides a pretreatment method and system for wastewater in a technology for preparing epoxy chloropropane by a propylene high-temperature chlorination process. The pretreatment method comprises the following steps: obtaining cyclization wastewater in the technology for preparing epoxy chloropropane by the propylene high-temperature chlorination process; mixing the cyclization wastewater with acid to obtain a mixed solution, wherein a pH value of the mixed solution is 8 to 9; mixing the mixed solution with a flocculant, stirring and settling to obtain a clear solution and sediment; centrifugally separating the sediment to obtain lime water and waste lime; returning the lime water to be flocculated and settled. According to the pretreatment method and system for wastewater inthe technology for preparing the epoxy chloropropane by the propylene high-temperature chlorination process, the acid is added to adjust the pH value of the cyclization wastewater, and the flocculantis added to flocculate suspended matter to pretreat the cyclization wastewater. The pretreatment method has the advantages of simple technological process and high treating efficiency; a content of suspension matter in the treated wastewater is as low as about 50ppm, and follow-up biochemical treatment is more facilitated.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a pretreatment method and system for wastewater in the process of preparing epichlorohydrin by high-temperature chlorination of propylene. Background technique [0002] Epichlorohydrin (ECH) is an important organic chemical raw material, because it contains epoxy groups and active chlorine in its molecule, it can be used as an intermediate in the synthesis of glycerin, and it is also a starting material for epoxy resin, nitroglycerin explosives, glass fiber reinforced plastics, and electrical insulation products. It is the main raw material and used as a solvent for cellulose esters and resins. It is also a raw material for the production of surfactants, medicines, pesticides, coatings, adhesives, ion exchange resins, plasticizers, glycerin derivatives, glycidyl derivatives, and chlorohydrin rubber. [0003] At present, the countries and regions that produce epichlorohydrin in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
CPCC02F1/38C02F1/52C02F3/00C02F9/00C02F2001/007C02F2103/36C02F2301/08
Inventor 刘利郝新兵杨超王新龙闫帅刘伟红曹小兵
Owner CHINA PETROLEUM & CHEM CORP
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