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A method for producing low-silica sodium chloride and sodium sulfate crystalline salt from catalyst wastewater

A technology of sodium chloride and catalyst is applied in the field of wastewater treatment to achieve the effect of improving quality and ensuring long-term operation

Active Publication Date: 2019-09-10
CHINA PETROLEUM & CHEM CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of the existing wastewater treatment, to provide a treatment process for the recycling and recycling of catalyst wastewater, and to realize the production of comprehensive wastewater with high ammonium, high silicon and high salt characteristics discharged during the catalyst production process, which can be industrially applied Low Silica Sodium Chloride and Sodium Sulfate Crystalline Salt

Method used

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  • A method for producing low-silica sodium chloride and sodium sulfate crystalline salt from catalyst wastewater
  • A method for producing low-silica sodium chloride and sodium sulfate crystalline salt from catalyst wastewater
  • A method for producing low-silica sodium chloride and sodium sulfate crystalline salt from catalyst wastewater

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Embodiment 1

[0034] 1. Catalyst waste water discharged by a refinery catalyst production company is used as the raw water in this example. The specific water quality data are shown in Table 1.

[0035] Table 1 Influent Water Quality

[0036]

[0037] 2. The water quality of sodium chloride and sodium sulfate solution after pretreatment + nanofiltration salt separation + membrane concentration is shown in Table 2.

[0038] Table 2 Water quality table of sodium chloride solution and sodium sulfate solution

[0039]

[0040] 3. The sodium chloride solution adjusts the pH value to 10.8, and then enters the MVR evaporative crystallization system 1, and the sodium sulfate solution enters the nitrate co-production evaporative crystallization system (MVR+secondary flash evaporation+crystallization process), and at the same time the mother liquor of the MVR evaporative crystallization system 1 It also enters the nitrate cogeneration evaporation crystallization system, the mother liquor of th...

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Abstract

The invention relates to a method of producing low-silicon sodium chloride and sodium sulfate crystalline salts from catalyst wastewater. In the method, through pretreatment, nano-filtration to separate salts, and membrane concentration, catalyst wastewater with NaCl as main component and catalyst wastewater with Na2SO4 as main component are obtained; and through a process in combination of different evaporative crystallization systems, high-grade low-silicon sodium chloride crystalline salt and industrially-applicable sodium sulfate crystalline salt are produced. The method effectively solves the problems that for the catalyst wastewater, ammonium and silicon dioxide are high in content and are difficult to remove, the crystalline salts are low in cost and contents of impurity salts are high.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for realizing recycling and utilization of nitrate, salt, ammonia and water resources in comprehensive waste water with high ammonium, high silicon and high salt characteristics discharged during the catalyst production process. Background technique [0002] With the stringent environmental protection policies and the requirements of sustainable economic, social and environmental development, it is an indispensable trend to achieve "near-zero discharge" of wastewater. [0003] The wastewater discharged from oil refining catalyst production usually has a high salt content, mainly sulfate, chloride, etc., the concentration can reach more than 10000 mg / L, and contains a relatively high concentration of ammonium (usually 100-2000mg / L) and silicon (Usually 20-120mg / L), almost no organic matter (TOC is basically less than 10mg / L). At present, this ki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04C01D5/16C02F1/04C02F1/06
Inventor 殷喜平吉春红赵旭顾松园周岩李叶郭嘉杨凌王丁申涛齐麟白建江徐淑朋张萌王生吉张健富曹善甫
Owner CHINA PETROLEUM & CHEM CORP
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