公开(公告)号：US20240238694A1

公开(公告)日：2024-07-18

申请号：US18009541

申请日：2022-07-27

Applicant: Changzhou Ruihua Chemical Engineering Technology Co., Ltd.

Inventor： Jing ZHANG ,  Chenggang HE ,  Jiahui GU ,  Haiyan ZHOU ,  Xia CHEN ,  Zhigang XU

IPC: B01D3/32 ,  B01D3/00 ,  B01D3/14 ,  B01D5/00 ,  C07C7/04

CPC classification number: B01D3/322 ,  B01D3/007 ,  B01D3/143 ,  B01D5/006 ,  C07C7/04

Abstract: The present disclosure provides a method for refining styrene by using falling film reboilers and heat pump technology to provide a heat source required by a separation column. According to the method, based on an existing energy-saving technology of coupled high and low pressure ethylbenzene/styrene separation columns, high-concentration gas-phase ethylbenzene separated from a top of a low pressure ethylbenzene/styrene column is directly pressurized through a compressor, or a heat pump working medium is gasified using the high-concentration gas-phase ethylbenzene separated from the top of the low pressure ethylbenzene/styrene column, and the gasified heat pump working medium is pressurized. The directly pressurized high-concentration gas-phase ethylbenzene or the indirectly gasified and pressurized high-concentration gas-phase ethylbenzene is fed into the falling film reboiler with low heat transfer temperature difference requirement to serve as a heat source of a pre-separation column and/or a styrene product column in a styrene separation process. According to the solution, energy consumption in the styrene separation process is further greatly reduced, costs can be recovered within a relatively short period of time after the production process is correspondingly improved and put into production, and long-term economic benefits are remarkable.

公开(公告)号：US20240207755A1

公开(公告)日：2024-06-27

申请号：US18555757

申请日：2022-07-22

Applicant: CHANGZHOU RUIHUA CHEMICAL ENGINEERING TECHNOLOGY CO., LTD.

Inventor： Chenggang HE ,  Jiahui GU ,  Jing ZHANG ,  Haiyan ZHOU ,  Zhigang XU

IPC: B01D1/22 ,  B01D1/30 ,  C07C5/327

CPC classification number: B01D1/22 ,  B01D1/30 ,  C07C5/327

Abstract: Disclosed herein is a low-pressure drop ethylbenzene evaporator, comprising a double-layer structure consisting of a heat exchange unit and a gas-liquid separation unit, the upper layer and the lower layer thereof being connected via an intermediate pipe. The top of the gas-liquid separation unit is provided with an exhaust pipe, and the bottom is provided with a separated liquid return pipe. The heat exchange unit comprises a housing side and a heat exchange pipe, the bottom of the housing side being provided with a liquid flow inlet, and a low-pressure vapor feed pipe being disposed on a side wall of the housing side, located below the heat exchange pipe and close to the position of the heat exchange pipe. In an energy saving process for ethylbenzene vaporization of the present application, a large amount of heat is recovered by means of a main cooler to generate a vapor at 6-32 kpaA, which is used for primary vapor distribution of the ethylbenzene vaporizer design of the present application after being pressurized by a compressor, and is used to replace supplemental 0.21 MPaG low-pressure vapor for a vapor pipe network of a related device, greatly reducing consumption of low-pressure steam in the reaction system, as well as decreasing the amount of circulating water used in the device. The process only consumes the power consumption of a compressor, and saves a large amount of low-pressure vapor and circulating water.