Filtration equipment to realize catalyst separation in polytetramethylene enigmatic glycol production

Abstract

The invention belongs to the technical field of chemical production equipment, and relates to a filtering device for realizing the separation of catalysts in the production of polytetramethylene enigmatic glycol, comprising an upper cylinder body and a lower cylinder body sealed and connected, and a tube plate fixedly connected to the inner wall of the lower cylinder body , the upper surface of the tube plate is fixedly connected to the filter element, the first polytetrafluoroethylene gasket is set between the filter element and the tube plate, the upper part of the filter element is set with a pressure plate, and several vertically extending screws are fixed on the tube plate, and the upper ends of the screws correspond to the pressure plate Through the through hole of the screw rod, a spring is sleeved on the upper end of the screw rod, the lower end of the spring is pressed against the upper surface of the pressure plate, and the upper end of the spring is pressed against the bottom surface of the nut on the screw rod. When the filtering device works, it runs stably, which greatly improves the use efficiency of the filter element.

Description

technical field [0001] The invention belongs to the technical field of chemical production equipment, and relates to a filtering equipment for realizing catalyst separation in the production of polytetramethylene enzymatic glycol. Background technique [0002] The filtration process of the filter is based on the different molecular diameters of the components in two or more mixed liquids to achieve the purpose of filtration. It is a commonly used unit operation for filtering liquid mixtures. It is widely used in chemical industry, biological fermentation and pharmaceuticals. It can not only extract and enrich products, but also filter out some other similar substances to obtain preliminary purification of products, such as beer production. Filtration of yeast and by-products, filtration of phenolic substances in sewage. At the same time, high-value substances are recovered as much as possible to effectively reduce production and operation costs, such as the filtration of he...

AI Technical Summary

Problems solved by technology

[0003] The existing PTMEG production catalyst separation equipment has the following defects: the material enters from the upper cylinder of the equipment, enters and exits from the outside of the filter element, and finally the clear liquid is extracted from the lower cylinder, and the heavy liquid is extracted from the upper cylinder. During operation, the catalyst It will deposit on the tube sheet and gradually solidify. The solidified catalyst tightly wraps the filter element and causes partial failure of the filter element; the connection between the filter element and the tube sheet is generally sealed with an O-ring. Under a certain pressure, the catalyst leaks from the seal and enters the clean room. liquid, leading to catalyst filtration failure; after the filter is fed, the high-temperature material causes the filter element to be heated and bent so that the filter membrane is destroyed, and the catalyst passes through the filter element and enters the clear liquid; the catalyst in the clear liquid enters the PTMG (polytetramethylene glycol) product to promote PTMG Thermal decomposition occurs; the filter element is gradually clogged during the filtration process, and the pressure difference increases, so it must be replaced, and the filter element replacement cycle is frequent

Existing filters not only waste a lot of expensive catalysts, but also increase the difficulty of catalyst treatment in subsequent sections. If you are not careful, catalysts may enter PTMEG and cause thermal decomposition of products, which has long restricted the stability and stability of PTMEG production equipment. Improvement of product quality

Images