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

A technology of liquid ring vacuum pump and jet pump, which is applied in the vacuum field of bisphenol A stripping unit, which can solve the problems of Roots seizure, inability to entrain liquid, and failure of Roots pump to work normally, so as to achieve simple operation and ensure long-term operation Effect

CN104056464AActive Publication Date: 2014-09-24NANTONG XINGCHEN SYNTHETIC MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-09-24

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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.
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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...

Examples

Embodiment Construction

[0012] A method for realizing the vacuum of the bisphenol A stripping unit by combining steam injection + liquid ring vacuum pump, sending the bisphenol A molten liquid containing a small amount of phenol into the stripping tower 1 through the feed line 8, and passing the steam at the bottom of the stripping tower Line 9 feeds stripping steam into stripping tower 1, and under vacuum conditions, phenol is vaporized and comes out from the top of stripping tower 1 and enters steam jet pump 2, and steam jet pump forms vacuum under the injection effect of jet steam 11, from The gaseous phenol and jet steam of the steam jet pump 2 are cooled by the cooler 12 and sent to the liquid ring vacuum pump 3. The working fluid of the liquid ring vacuum pump 3 is the circulating phenol-containing water from the cooler 5, and the phenol-containing water from the liquid ring vacuum pump 3 Water and non-condensable gas are sent into the gas-liquid separation tank 4, and the non-condensable gas is...