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Treatment method of maleic anhydride production waste liquid

A treatment method and technology for waste liquid, applied in combustion methods, chemical instruments and methods, heating water/sewage treatment, etc., can solve the problems of large fuel gas consumption, low B/C ratio, uneconomical, etc., and reduce production and operation. Cost, lower operating temperature, less coking effect

Inactive Publication Date: 2020-04-28
惠州宇新新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solvent DBP has a benzene ring, and DIBE has a saturated six-membered ring. The COD value of the sewage is about 20,000-30,000 mg / L, the pH value is 1-2, the B / C ratio is low, and the biodegradability is poor.
[0004] At present, biochemical treatment is mostly used in industry, but due to the poor biodegradability of the sewage, pretreatment, anaerobic treatment, aerobic treatment, post-treatment, etc. are required, the process is long, the floor area is large, the investment is large, and the operation and maintenance are complicated. ; There are also industrial installations that use the traditional incineration method to spray the waste liquid into the direct-fired incinerator, but this method needs to consume a large amount of fuel gas, which is economically unreasonable; although the wet oxidation method can treat waste liquid containing benzene rings and is difficult to biochemically , but due to the need for high temperature and high pressure conditions, there are also disadvantages of high energy consumption and uneconomical

Method used

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  • Treatment method of maleic anhydride production waste liquid
  • Treatment method of maleic anhydride production waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] See the following table for the waste liquid indicators of the maleic anhydride plant:

[0025] Table 1 Waste liquid index of maleic anhydride plant

[0026]

[0027] The waste liquid enters the preheater through the feed pump, the feed rate is 10000kg / h, the first-effect evaporator is heated by 4500kg / h steam, the steam pressure is 0.3MPa, and the gas phase outlet pressure of the three-effect evaporator is controlled to 12KPaA. At this time, the first-effect evaporator The gas phase temperature is 96°C, the bottom liquid phase temperature is 108°C, the gas phase temperature of the second-effect evaporator is 65°C, the bottom liquid phase temperature is 86°C, the gas phase temperature of the three-effect evaporator is 50°C, the bottom liquid phase temperature is 68°C, and the bottom of the three-effect evaporator is concentrated Liquid output 1000kg / h. The maleic anhydride plant is equipped with a direct-fired incinerator, and the concentrated liquid is sent to the ...

Embodiment 2

[0029] The indicators of the waste liquid are the same as in Example 1, the waste liquid enters the preheater through the feed pump, the feed rate is 10000kg / h, the first effect evaporator is heated by 4500kg / h steam, the steam pressure is 0.5MPa, and the gas phase outlet pressure of the three effect evaporator is controlled 20KPaA, at this time, the gas phase temperature of the first effect evaporator is 106°C, the bottom liquid phase temperature is 118°C, the gas phase temperature of the second effect evaporator is 75°C, the bottom liquid phase temperature is 96°C, the gas phase temperature of the three effect evaporator is 60°C, and the bottom liquid phase temperature is 77 ℃, the discharge of concentrated liquid at the bottom of the three-effect evaporator is 1000kg / h. The maleic anhydride plant is equipped with a direct-fired incinerator, and the concentrated liquid is sent to the direct-fired incinerator for treatment. Using butane gas as fuel, controlling the furnace te...

Embodiment 3

[0031] The indicators of the waste liquid are the same as in Example 1, the waste liquid enters the preheater through the feed pump, the feed rate is 10000kg / h, the first effect evaporator is heated by 3000kg / h steam, the steam pressure is 0.3MPa, and the gas phase outlet pressure of the three effect evaporator is controlled 12KPaA, at this time, the gas phase temperature of the first effect evaporator is 94 °C, the bottom liquid phase temperature is 103 °C, the gas phase temperature of the second effect evaporator is 66 °C, the bottom liquid phase temperature is 81 °C, the gas phase temperature of the three effect evaporator is 51 °C, and the bottom liquid phase temperature is 63 ℃, the discharge of concentrated liquid at the bottom of the three-effect evaporator is 4000kg / h. The maleic anhydride plant is equipped with a direct-fired incinerator, and the concentrated liquid is sent to the direct-fired incinerator for treatment. Use butane gas as fuel, control the furnace temp...

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Abstract

The invention discloses a treatment method of maleic anhydride production waste liquid. The treatment method comprises the steps: waste liquid is pumped into a preheater for preheating, the preheatedwaste liquid sequentially enters a first-effect heating chamber, a second-effect heating chamber and a third-effect heating chamber for evaporating and concentrating, and then the concentrated liquidenters an incinerator to be treated and the gas phase enters a condenser to be condensed, wherein the first-effect heating chamber uses live steam for evaporation, steam generated by the first-effectheating chamber is used as a heat source of the second-effect heating chamber, steam generated by the second-effect heating chamber is used as a heat source of the third-effect heating chamber, and avacuum pump is used for maintaining negative pressure operation of the third-effect heating chamber. According to the treatment method, multiple-effect evaporation is adopted to concentrate the wasteliquid, the amount of used steam is small, the production operation cost can be reduced and the energy-saving and consumption-reducing principle is met.

Description

technical field [0001] The invention relates to the technical field of compound production, in particular to a treatment method for maleic anhydride production waste liquid. Background technique [0002] Maleic anhydride is the abbreviation of maleic anhydride, also known as maleic anhydride and 2,5-furandione. It is currently the third largest anhydride in the world after phthalic anhydride and acetic anhydride. Maleic anhydride has a strong pungent smell, is insoluble in petroleum ether and carbon tetrachloride, soluble in ethanol, ether and acetone, is orthorhombic, colorless needle-like or flaky crystals. It is mainly used as a raw material for the production of 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resin, alkyd resin, etc. It is also used in medicine and pesticides. [0003] In the past, maleic anhydride was prepared by catalytic oxidation of benzene, but now the benzene method is gradually replaced by n-butane oxidation...

Claims

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Application Information

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IPC IPC(8): C02F1/04F23G7/04C02F101/34C02F101/30
CPCC02F1/04C02F2101/30C02F2101/34F23G7/04F23G2209/101
Inventor 夏志强黄峰黄马扶胡先念秦子轩
Owner 惠州宇新新材料有限公司
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