Method for indirectly monitoring, regulating and controlling trace water in polyolefin reactor
A reactor, polyolefin technology, applied in chemical instruments and methods, control/regulating processes, chemical/physical/physical-chemical processes, etc., can solve the problems of long reaction period, operation lag, low sensitivity of monitoring system, etc. The effect of short cycle, reduced energy consumption and less investment in equipment
Active Publication Date: 2020-12-11
ZHEJIANG UNIV
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Problems solved by technology
Some factories use the static signal fluctuation detection method to monitor the water content in the reactor, but only when the water content in the reactor is greater than 10ppm, can they receive a relatively obvious static fluctuation signal, and then the operator can manually adjust it. During the whole monitoring process, the monitoring system has low sensitivity, long response cycle and operation lag
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[0035] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0036] as attached figure 2 As shown, after the ethylene and hydrogen are pressurized by the compressor C1 and cooled by the cooler D1, they enter the fluidized bed reactor R for polymerization, and the total flow of the stream entering the reactor is 1080 kmol / hr, wherein the total flow of fresh ethylene and hydrogen It is 200kmol / hr. Unreacted ethylene and hydrogen circulate from the top of the reactor into the compressor C1, and the polyolefin resin produced by the reac...
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The invention discloses a method for indirectly monitoring, regulating and controlling trace water in a polyolefin reactor. The method comprises the following steps: a detection step: detecting the pressure change of a stream in a cold box by using a pressure detection device, and transmitting information to a calculation device; a calculation and analysis step: analyzing the pressure informationfrom the detection step through the calculation device, calculating the water content of the stream entering the cold box, indirectly calculating the content of the water in a polyolefin reactor, carrying out early warning on abnormal conditions, and sending an adjustment instruction to a control step at the same time; and the control step: receiving the instruction information from the calculation and analysis step, controlling a valve v1 to adjust the flow of inactivated steam, and controlling a valve v2 to adjust the flow of the stream entering a dehydration tower, so that the water contentof the reactor is reduced, and the yield is improved. According to the method, through coordination and cooperation of the detection step, the calculation and analysis step and the control step, thewater content of the reactor can be rapidly detected, the flow of water removal operation and the flow of inactivated steam can be adjusted in real time, and the overall production efficiency is improved.
Description
technical field [0001] The invention belongs to the field of polyolefin production, and in particular relates to a method for indirect monitoring and regulation of trace water in a polyolefin reactor. Background technique [0002] During the production of olefin polymers, unreacted hydrocarbons (ethylene, ethane, propylene, butene, butane, isopentane, hexene, etc.), nitrogen, residual catalyst, etc. These unreacted hydrocarbons must be removed and the residual catalyst in the polyolefin resin must be deactivated to meet environmental protection standards and ensure the safety of downstream processes and products. At present, the gas-phase polymerization process is widely used in factories due to its simple process flow, flexible and convenient operation, wide range of products, and low investment cost. CN104792117B etc.) disclosed in. [0003] In order to deactivate the residual catalyst in the resin, it is usually necessary to add deactivation steam into the degassing ch...
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IPC IPC(8): C08F10/00C08F110/02C08F2/01B01J19/00
CPCB01J19/0006C08F10/00C08F110/02C08F2/01
Inventor 廖祖维董轩阳永荣王靖岱黄正梁包崇龙蒋斌波孙婧元杨遥张浩淼张池金林渠成王瑞航沈煜栋
Owner ZHEJIANG UNIV