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Design and development of SMPO wastewater three-effect evaporator

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Changzhou Ruihua Chemical has accumulated more than ten years of experience in ethylbenzene/styrene industrial engineering design, and successfully developed a complete set of ethylbenzene/styrene process technology at the beginning of the company's establishment. After nearly 10 years of technological improvement, the technology package has reached the leading level in all evaluation indicators in the latest equipment currently in operation.
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The wastewater produced in the SMPO production process is extremely difficult to treat due to its high temperature, high alkalinity, and high chemical oxygen consumption characteristics, which makes it difficult for the bacteria to survive biochemical treatment.
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Double tube plate is a relatively common structure in heat exchangers in recent years. In order to avoid mixing of the two media in the tube side and the shell side to cause the material to be scrapped or cause a major accident, the double tube plate structure is generally adopted. During the hydraulic test of the equipment, the inner tube sheet leaked, which was difficult to rework, which would cause the equipment to be reworked. Therefore, the difficulty in manufacturing the heat exchanger with this structure was mainly the expansion of the inner tube sheet. If there is no experience in expansion of the same material and specification, expansion simulation test should be done to determine the expansion parameters.
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Design and development of SMPO wastewater three-effect evaporator

The wastewater produced in the SMPO production process is extremely difficult to treat due to its high temperature, high alkalinity, and high chemical oxygen consumption characteristics, which makes it difficult for the bacteria to survive biochemical treatment.
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Overview

The wastewater produced in the SMPO production process is extremely difficult to treat due to its high temperature, high alkalinity, and high chemical oxygen consumption characteristics, which makes it difficult for the bacteria to survive biochemical treatment. However, biochemical methods are currently used to treat SMPO wastewater in China. Regarding the salt-containing industrial wastewater from the SMPO plant, Ruikai Chemical has developed a more concise multi-effect evaporation treatment equipment, which uses evaporation technology to concentrate the wastewater from the styrene/propylene oxide co-production plant, and the concentrated high-salt content Wastewater is treated by incineration, and the distilled water from which salt is removed is sent to biochemical treatment, which solves the problem that salt-containing wastewater cannot be biochemically treated. This set of equipment can not only reduce the cost of SMPO wastewater treatment, but also save land, which is very valuable for chemical plants or other devices.

 

Key equipment

Some key equipment of the process is shown in the figure, and the details are shown in the table below:

a

 

Application examples

Adopting internal circulation technology to develop an integrated, low-occupancy and low-energy three-effect evaporator for wastewater treatment in a styrene/propylene oxide co-production unit, which not only makes wastewater treatment more energy-efficient, but also ensures wastewater treatment In addition, the use of an integrated three-effect evaporator can not only save land, but also greatly reduce investment and operating costs.

Major customers in recent years:

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