Method for achieving bisphenol A steam extraction unit vacuum through steam jetting and liquid ring vacuum pump

Abstract

The invention discloses a method for achieving bisphenol A steam extraction unit vacuum through steam jetting and a liquid ring vacuum pump, the vacuum of units needed in production of bisphenol A is formed through the liquid ring vacuum pump, the defects in the prior art can be overcome, operation is easy, operation of the vacuum pump cannot be affected even when the gas phase in the liquid ring vacuum pump carries a small amount of liquid or the temperature of materials in the gas phase is high, shutdown and other faults of equipment cannot be caused, the production can still be continued, the equipment can be made of corrosion resistant stainless steel materials, the equipment cannot be corroded, the long-term operation of the equipment is guaranteed, steam does not need to be consumed, phenolic wastewater is not produced, and therefore a matched recycling technology and device are not needed.

Description

technical field [0001] The invention relates to a method for realizing the vacuum of a bisphenol A stripping unit by steam injection and a liquid ring vacuum pump. Background technique [0002] In the production of bisphenol A, the bisphenol A solution containing a small amount of phenol needs to be stripped under vacuum conditions to remove phenol and obtain high-purity bisphenol A products. In the past, the vacuum system was based on Roots pump or The combination of Roots and liquid ring pumps can meet the requirements of vacuum, but there are deficiencies. [0003] For the Roots vacuum pump, the gas phase material entering the vacuum pump cannot entrain liquid, nor can it entrain tiny particles of impurities, otherwise the Roots of the equipment will be stuck. When the temperature of the gas phase material entering the Roots pump is too high, due to The gap between the Roots is small, and it is very easy to cause the failure of the roots to be seized due to the reduction...

AI Technical Summary

Problems solved by technology

[0003] For the Roots vacuum pump, the gas phase material entering the vacuum pump cannot entrain liquid, nor can it entrain tiny particles of impurities, otherwise the Roots of the equipment will be stuck. When the temperature of the gas phase material entering the Roots pump is too high, due to The gap between the Roots is small, and it is very easy to cause the failure of the roots to be seized due to the reduction of the thermal expansion gap, so that the Roots pump cannot work normally, so that the stable and continuous production of the entire device or unit cannot be guaranteed. Moreover, due to the thermal expansion of the Roots The reason is that for Roots, stainless steel materials that require corrosion resistance cannot be used as a whole. The current domestic technology is to add stainless steel coating on the surface of Roots. The coating may fall off during use, which will cause equipment corrosion. Although Roots can be made of corrosion-resistant stainless steel abroad, but foreign equipment is expensive

[0004] For the vacuum system formed by the combination of Roots and liquid ring pumps, due to the shortcomings in the production and operation of Roots pumps, the reliability of the equipment is still not well resolved

Images