Unlock instant, AI-driven research and patent intelligence for your innovation.

Pressure control of catalyst mixing vessel

A technology of mixing container and catalyst slurry, which is applied in the direction of fluid pressure control, non-electric variable control, control/regulation system, etc.

Inactive Publication Date: 2013-04-17
TOTAL RES & TECH FELUY
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method and catalyst slurry preparation system of the present invention therefore overcome at least some of the problems set forth herein

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pressure control of catalyst mixing vessel
  • Pressure control of catalyst mixing vessel
  • Pressure control of catalyst mixing vessel

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0108] figure 2 Schematic representation similar to figure 1 The catalyst slurry preparation system of the preparation system, wherein the difference is that it includes 2 mud tanks 2 containing the concentrated catalyst slurry. Both mud pots have a fill valve 32 for adding diluent into the mud pot 2 . Conduits 6, 7 and 15 connect mud pot 2 to mixing vessel 3, in which the catalyst slurry is diluted to a concentration suitable for use in the polymerization reaction. Conduits 6 and 7 have a catalyst slurry feeder 9 for metering the feed of catalyst slurry from mud pot 2 into mixing vessel 3, and an injection valve 24 for injecting diluent. The mixing vessel 3 has mixing means 25 (for example impeller blades provided on a rotatable shaft). The diluted slurry is then pumped through conduit 4 to polymerization reactor 1 . For this purpose, the conduit 4 connecting the mixing vessel 3 to the polymerization reactor 1 has pumping means. The conduit 4 may also have a diluent flu...

Embodiment

[0122] Catalyst slurries were prepared in a mixing vat operating flooded. The mixing tank is provided with a pressure regulating unit without a pulsation damper. When the catalyst metering was stopped, high pressure was observed several times due to the temperature difference between day and night, where isobutane escaped through the pressure safety valve. After installing the pulsation damper, this pressure increase was no longer observed and the loss of isobutane was prevented.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention relates to a process for preparing catalyst slurry in a catalyst slurry preparation system and supplying catalyst slurry to an ethylene polymerization loop reactor wherein an accurate control of the pressure within said catalyst slurry preparation system is provided. More particularly, the present invention provides a method for preparing a catalyst slurry and supplying said catalyst slurry to an ethylene polymerization loop reactor, said catalyst slurry comprising solid catalyst and a liquid hydrocarbon diluent, wherein said method comprises the steps of: (a) feeding concentrated catalyst slurry to a mixing vessel by means of a feeding device; (b) diluting said concentrated catalyst slurry in a suitable amount of said diluent in a mixing vessel thereby obtaining a diluted catalyst slurry having a concentration suitable for use in an ethylene polymerization reaction; wherein said mixing vessel is provided with at least one pressure regulating unit connected therewith and wherein said pressure regulating unit comprises a pulsation dampener; and (c) transferring said diluted catalyst slurry from said mixing vessel to said ethylene polymerization loop reactor; characterized in that the method comprises the step of maintaining said mixing vessel essentially free of a gaseous phase by regulating the pressure in said mixing vessel using said at least one pressure regulating unit comprising the pulsation dampener.

Description

technical field [0001] The present invention relates to a method of preparing catalyst slurry in a catalyst slurry preparation system and supplying the catalyst slurry into an ethylene polymerization loop reactor wherein precise control of the pressure within said catalyst slurry preparation system is provided. More particularly, the present invention relates to a method of regulating pressure within a catalyst slurry preparation system including a mixing vessel maintained in a flooded state. Catalysts that can be prepared and supplied using the present invention include chromium, Ziegler-Natta and metallocene catalysts. Background technique [0002] Polyolefins such as polyethylene (PE) are produced by making ethylene (CH 2 =CH 2 ) synthesized by polymerization of monomers. Polyethylene polymers are useful in many applications because they are cheap, safe, stable to most environments, and easy to process. According to properties, polyethylene can be divided into several...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/02C08F2/01C08F2/14
CPCB01J8/0035B01J8/20B01J2219/00162C08F10/02C08F2/14C08F2/01B01J19/00C08F4/76G05D16/02
Inventor A.布鲁塞勒D.德瓦克特L.福阿吉
Owner TOTAL RES & TECH FELUY