Method for heating a viscous polyethylene solution
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08F-006/00
B01D-003/06
출원번호
US-0535004
(1990-06-07)
발명자
/ 주소
Dighton Gaylon L. (Baton Rouge LA) Brookins Thomas M. (Baton Rouge LA)
출원인 / 주소
The Dow Chemical Company (Midland MI 02)
인용정보
피인용 횟수 :
23인용 특허 :
5
초록▼
The invention disclosed herein is a single-pass, horizontal heat exchanger, of the shell and tube type, which is designed for preheating of a viscous material, such as the reactor effluent of a polyethylene solution. The heat exchanger is made in three sections, each of which can be heated independe
The invention disclosed herein is a single-pass, horizontal heat exchanger, of the shell and tube type, which is designed for preheating of a viscous material, such as the reactor effluent of a polyethylene solution. The heat exchanger is made in three sections, each of which can be heated independently with a heating fluid, so that a temperature profile can be easily maintained along the entire length of the exchanger. Also, each section can be removed from the exchanger unit independently of the other sections, for cleaning, if the section becomes plugged.
대표청구항▼
A method for heating the reactor effluent of a polyethylene (PE) solution, and controlling the temperature of the solution, to thereby recover co-monomer and polymer phases of the solution, which comprises the steps of: assembling a single-pass, horizontal, shell and tube heat exchanger, which inclu
A method for heating the reactor effluent of a polyethylene (PE) solution, and controlling the temperature of the solution, to thereby recover co-monomer and polymer phases of the solution, which comprises the steps of: assembling a single-pass, horizontal, shell and tube heat exchanger, which includes an inlet section, a central section and an outlet section; each section defining a tube bundle enclosed within a shell member; the inlet section including an inlet head member positioned ahead of the tube bundle, and the inlet section being joined to the central section, with a first chamber being defined between these sections; the central section being joined to the outlet section, with a second chamber being defined between these sections; the outlet section including an outlet head member positioned behind the tube bundle; the first chamber, second chamber, and outlet head member each having installed therein a means for measuring temperature and pressure inside the heat exchanger; the means for measuring temperature and pressure being connected into a control system; the inlet section, central section, and outlet section each having installed therein a means for directing a heating fluid into and out of each of these sections; directing the PE solution into the inlet head member, through a product inlet means in communication with the inlet head member; moving the PE solution through the tube bundles of the inlet section, the central section, and the outlet sections, and out the outlet head member at a pressure sufficient to keep the solution from vaporizing; passing a heating fluid through the shell member of the inlet section, to heat the PE solution to a first desired temperature level; measuring the pressure and temperature of the PE solution as it moves through the first chamber, and using the control means to maintain the temperature of said solution at said first desired level; moving the polyethylene solution through the tube bundle of the central section and the second chamber; passing a heating fluid through the shell member of the central section, to heat the PE solution to a second desired temperature level; measuring the pressure and temperature of the PE solution as it moves through the second chamber, and using the control means to maintain the temperature of said solution at said second desired level; moving the PE solution through the tube bundle of the outlet section and the outlet head member; passing a heating fluid through the shell member of the outlet section, to heat the polyethylene solution to a third desired temperature level; measuring the pressure and temperature of the polyethylene solution as it moves through the outlet head member, and using the control means to maintain the temperature of said solution at said third desired level; moving the polyethylene solution, as a mixture of the monomer, co-monomer, hydrocarbon solvent and polymer phases, out of the outlet head member into a product outlet means in communication with the outlet head member; and thereafter reducing the pressure sufficiently to vaporize unreacted monomer and solvent in said solution.
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이 특허에 인용된 특허 (5)
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Takao Hiroyoshi (Chiba JPX) Inoue Yoshio (Kimitsu JPX) Yamazaki Hirotami (Ichihara JPX), Process for separating a polymer from a solution containing the same.
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