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 main

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  • Treatment method of maleic anhydride production waste liquid

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0023] Example 1

[0024] The waste liquid indicators of maleic anhydride device are shown in the following table:

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

[0026]

[0027] The waste liquid enters the preheater through the feed pump, the feed rate is 10000kg / h, the first-effect evaporator uses 4500kg / h steam heating, the steam pressure is 0.3MPa, and the gas outlet pressure of the three-effect evaporator is controlled to 12KPaA, at this time the first-effect evaporator Gas phase temperature 96℃, bottom liquid phase temperature 108℃, second effect evaporator gas phase temperature 65℃, bottom liquid phase temperature 86℃, triple effect evaporator gas phase temperature 50℃, bottom liquid phase temperature 68℃, triple effect evaporator bottom concentration Liquid discharge 1000kg / h. The maleic anhydride device is equipped with a direct-fired incinerator, and the concentrated liquid is sent to the direct-fired incinerator for processing. Using butane gas as the f...

Example Embodiment

[0028] Example 2

[0029] The waste liquid index is 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 uses 4500kg / h steam heating, the steam pressure is 0.5MPa, and the gas outlet pressure of the three-effect evaporator is controlled. 20KPaA, the first-effect evaporator has a gas phase temperature of 106°C, the bottom liquid phase temperature is 118°C, the second-effect evaporator has a gas phase temperature of 75°C, and the bottom liquid phase temperature is 96°C, and the three-effect evaporator has a gas phase temperature of 60°C and a bottom liquid phase temperature of 77 ℃, 1000kg / h of concentrated liquid at the bottom of the three-effect evaporator. The maleic anhydride device is equipped with a direct-fired incinerator, and the concentrated liquid is sent to the direct-fired incinerator for processing. Using butane gas as the fuel, controlling the furnace temperature of the direct-...

Example Embodiment

[0030] Example 3

[0031] The waste liquid indicators 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 uses 3000kg / h steam heating, the steam pressure is 0.3MPa, and the gas outlet pressure of the three-effect evaporator is controlled. 12KPaA, at this time, the gas phase temperature of the first-effect evaporator is 94℃, the bottom liquid phase temperature is 103℃, the second-effect evaporator gas phase temperature is 66℃, the bottom liquid phase temperature is 81℃, the three-effect evaporator gas phase temperature is 51℃, and the bottom liquid phase temperature is 63℃. ℃, 4000kg / h of concentrated liquid at the bottom of the three-effect evaporator. The maleic anhydride device is equipped with a direct-fired incinerator, and the concentrated liquid is sent to the direct-fired incinerator for processing. Using butane gas as fuel, controlling the furnace temperature of the direct-fire...

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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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