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A kind of recycling method of producing fine powder and waste water by sulfur transfer agent

A sulfur transfer agent, a technology for producing wastewater, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. performance issues, etc.

Active Publication Date: 2018-04-13
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Because the sulfur transfer agent contains a variety of metal components that are easy to pollute the FCC catalyst, its production wastewater cannot be reused in the production of FCC catalyst
Even if the waste water is reused in the production process of the sulfur transfer agent itself, if it is directly recycled online without treatment, there will be the following problems: (1) if it is reused to prepare the rare earth impregnation solution, the fine particles and rare earth flocculation and precipitation contained therein will Continuous accumulation will cause the filter cloth mesh to be gradually blocked, and the filtration efficiency will be greatly reduced; (2) If it is reused in the gel forming process, when the colloid spray is formed, the solid particles contained will not only easily wear the atomizing nozzle of the spray drying tower, but also Adhesion with colloid results in poor sphericity of additive particles, which affects wear resistance
[0010] In the above-mentioned prior art, the production process and composition characteristics of sewage are significantly different from those produced by sulfur transfer agents, and most of them need to add flocculants, chemical precipitants and other substances, the operation is relatively complicated, and the solid-liquid separation efficiency is not high enough.
In addition, it does not involve the combination of the generated fine powder and the treatment of waste water, and the online reuse in the catalyst production process

Method used

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  • A kind of recycling method of producing fine powder and waste water by sulfur transfer agent

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Experimental program
Comparison scheme
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preparation example Construction

[0029] The preparation method of the sulfur transfer agent is generally to first gel the magnesium hydroxide, magnesium oxide, alumina, clay, etc. as the carrier material in the gelling kettle, and then form the carrier microsphere particles similar to the catalytic cracking catalyst by spray drying. , the carrier microsphere particles are roasted, and then the active components mainly including rare earth elements such as cerium are loaded on the carrier by impregnation in an impregnation tank, and then dried. According to the present invention, the wastewater from the production of the sulfur transfer agent can be all wastewater generated during the production of the sulfur transfer agent, such as wastewater generated during immersion, wherein the pH value of the wastewater is about 5-8, and generally contains object (RE 2 o 3 ) in the amount of 1-20 grams / liter of rare earth elements, the rare earth elements in the wastewater can exist in the state of ions or in the state ...

Embodiment 1

[0039] This example illustrates the method for the production of fine powder by the sulfur transfer agent of the present invention and the on-line recycling of waste water.

[0040] According to the volume flow meter, add 10 g of sulfur transfer agent fine powder roasted at 650° C. for 1.5 h to each liter of waste water, stir and mix, and adjust the pH value to 4 with hydrochloric acid. The wastewater suspension is pumped into the hydrocyclone, the inlet pressure is 0.35MPa, and the volume flow ratio of underflow to overflow is 1:8. The clear liquid phase at the overflow outlet is transported to the inlet of the tubular centrifuge, the centrifuge speed is 15000rpm, the solid phase sediment is removed every 1 hour, and the particulate matter content of the clear liquid phase is 0.13g / L.

[0041] The supernatant liquid is sent to the carrier impregnation tank, which is used for the excess impregnation of the loaded rare earth in the sulfur transfer carrier. Use 1m each time 3 ...

Embodiment 2

[0044] This example illustrates the method for the production of fine powder by the sulfur transfer agent of the present invention and the on-line recycling of waste water.

[0045] According to the volume flow meter, add 5 g of unroasted sulfur transfer agent fine powder to each liter of waste water, stir and mix, and adjust the pH value to 5 with hydrochloric acid. The wastewater suspension is pumped into the hydrocyclone with an inlet pressure of 0.4MPa and a ratio of underflow to overflow volume flow of 1:10. The clear liquid phase at the overflow outlet is transported to the inlet of the tubular centrifuge, the centrifuge speed is 12000rpm, the solid phase sediment is removed every 50min, and the average content of the clear liquid phase particles is 0.72g / L.

[0046]The supernatant liquid is sent to the carrier impregnation tank, which is used for the excess impregnation of the loaded rare earth in the sulfur transfer carrier. Use 1m each time 3 The clear liquid can re...

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Abstract

A method for recycling fine powder and waste water produced by a sulfur transfer agent, the method comprising: adding the fine powder of the sulfur transfer agent to the waste water produced by the sulfur transfer agent as a settling aid, and then controlling the pH value of the waste water at 2-6; After the wastewater is subjected to solid-liquid separation treatment twice, the obtained secondary clear liquid is sent to the carrier impregnation tank for reuse, and the obtained heavy phase and / or sediment is ground and sent to the production process of sulfur transfer agent The additives in the glue can be reused in the glue tank. The invention can reuse the fine powder of additives, rare earth elements and solid particles dissolved in waste water, which not only recovers resources, but also reduces environmental pollution.

Description

technical field [0001] The invention relates to a method for recycling fine powder produced by a sulfur transfer agent and waste water. Background technique [0002] In the fluidized catalytic cracking (FCC) process, the raw oil and the catalyst are quickly contacted in the riser for catalytic cracking reaction, and the coke generated by the reaction is deposited on the catalyst to cause its deactivation, and the deactivated catalyst enters after stripping The regenerator performs char regeneration. During the regeneration process, the sulfur-containing compounds deposited in the coke are oxidized to generate SOx, which is discharged into the atmosphere along with the regeneration flue gas, causing environmental pollution. [0003] The use of flue gas SOx transfer aids (also known as sulfur transfer aids or sulfur transfer agents) is the main technical measure to control SOx emissions from regeneration flue gas of FCC units. Its working principle is that in the regenerator...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 宋海涛尹喆朱玉霞杨凌蒋文斌王文胜赵留周赵春晖田辉平宋世兵
Owner CHINA PETROLEUM & CHEM CORP
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