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Pretreatment method for step-by-step demulsification and flocculation of DMTO catalyst centrifugal mother liquid through integrated internal-circulation reactor

A centrifuge mother liquor and reactor technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, natural water treatment, etc., can solve the incomplete dissolution of bundled silica-aluminophosphate gel, phosphorus and aluminum gel interference Subsequent treatment, difficult dehydration of dissolved substances, etc., to achieve the effect of saving dosage, saving dilution water, and eliminating reaction back-dissolution

Inactive Publication Date: 2015-04-22
马同奎 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the eluate is difficult to dehydrate when the centrifuged mother liquor of the DMTO catalyst is subjected to "demulsification" treatment by the acidification method, the stripped silica-aluminophosphate gel is not completely dissolved and the reaction redissolves during the flocculation treatment, and phosphorus and aluminum gels are repeatedly formed Interfering with the subsequent treatment, and providing a pretreatment method for demulsification and flocculation of the DMTO catalyst centrifuged mother liquor step by step using an integrated-internal circulation reactor

Method used

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  • Pretreatment method for step-by-step demulsification and flocculation of DMTO catalyst centrifugal mother liquid through integrated internal-circulation reactor
  • Pretreatment method for step-by-step demulsification and flocculation of DMTO catalyst centrifugal mother liquid through integrated internal-circulation reactor

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specific Embodiment approach 1

[0023]Embodiment 1: In this embodiment, the pretreatment method of demulsification and flocculation of the DMTO catalyst centrifuged mother liquor is carried out step by step by using the integration-internal circulation reactor, which is composed of the integration-internal circulation reactor device A / B / C / D It is realized by connecting the pre-demulsification reactor A, the demulsification reactor B, the primary flocculation reactor C and the secondary flocculation reactor D in series and running step by step, specifically as follows:

[0024] One, first, the DMTO catalyst centrifugal mother liquor is diluted with water in proportion, centrifugal mother liquor: tap water=1: (3~5);

[0025] 2. The diluted centrifugal mother liquor is continuously injected into the pre-demulsification reaction tank A13 through the liquid inlet flowmeter A2 and the water inlet A1 of the pre-demulsification reactor according to the designed unit time, and the pre-demulsification reaction is start...

specific Embodiment approach 2

[0029] Embodiment two: the difference between this embodiment and embodiment one is: the horizontal position of the water outlet A12 of the pre-emulsification reactor is higher than the horizontal position of the water outlet B12 of the demulsification reactor by 20 cm, and the water outlet B12 of the demulsification reactor The horizontal position is 20cm higher than the horizontal position of the water outlet C12 of the primary flocculation reactor, and the horizontal position of the water outlet C12 of the primary flocculation reactor is 20cm higher than the horizontal position of the water outlet D12 of the secondary flocculation reactor. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this specific embodiment and specific embodiment one or two is: first pre-demulsification reaction tank A13 and sedimentation tank A14 are filled with water, and the pH value in A13, A14 is adjusted to 6 with pre-demulsifier ~6.5; similarly, the demulsification reaction tank B13 and sedimentation tank B14 are also filled with water, and the pH value in B13 and B14 is pre-adjusted to between 1.5 and 2.0 with a demulsifier, and the primary flocculation reaction tank C13, sedimentation tank Pool C14, secondary flocculation reaction pool D13, and sedimentation pool D14 are filled with water, and the pH values ​​in C13, C14, D13, and D14 are pre-adjusted to 4.5-5.0 and 8.5-9.0 respectively with calcium hydroxide solution, and then The centrifugal mother liquor is injected into the pre-demulsification reaction tank A13 from the centrifuge mother liquor inlet A1. Others are the same as in the first or second embodiment.

[003...

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Abstract

The invention discloses a pretreatment method for step-by-step demulsification and flocculation of DMTO catalyst centrifugal mother liquid through an integrated internal-circulation reactor and relates to industrial sewage pretreatment methods. The pretreatment method aims to solve the technical problems that when an existing demulsification method is used for treating the DMTO catalyst centrifugal mother liquid, existing aluminium phosphate gel, sarciniform silicon aluminium phosphate gel (Al2O3-P2O5-SiO2-H2O) and other colloids are not dissolved out thoroughly, and in the flocculation treatment process, reaction re-dissolution happens, phosphate and aluminium gel is regenerated again, and the subsequent treatment process is disturbed. An integrated internal-circulation reactor system is composed of a reaction tank, a variable speed blender, a settling pond, an outflow water relay pond and an internal circulation backflow system. After the centrifugal mother liquid is treated step by step according to the order of pre-demulsification, demulsification, primary flocculation and secondary flocculation, COD is lowered by 70-90 percent, the sludge density index SDI15 of hydrocolloids is lower than four, and advanced treatment of recycling units is benefited. The method can be applied to pretreatment of other industrial sewage.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a pretreatment method for stepwise demulsification and flocculation of DMTO catalyst centrifuged mother liquor by using an integrated-internal circulation reactor. Background technique [0002] DMTO (Methanol to Olefins) is a key technology for the production of basic chemical raw materials such as ethylene and propylene by replacing petroleum with coal. The production capacity of low-carbon olefins is a symbol of the development of a country's petrochemical industry and the degree of economic development. As important petrochemical products, ethylene and propylene were mainly produced from petroleum in the past. With the decrease of crude oil reserves, the production of low-carbon olefins by "replacing oil with coal" is an important way to realize my country's energy substitution strategy, ensure national energy security, and cultivate a new industrial chain. Meth...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/52C02F1/5236C02F2103/36C02F2301/08
Inventor 马同奎葛翔
Owner 马同奎
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