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

Continuous slurry polymerization volatile removal

A polymer, space-time yield technology, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physicochemical processes, etc.

Inactive Publication Date: 2007-02-28
EXXONMOBIL CHEM PAT INC
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Equipment and utility costs for distillation and handling can be a significant portion of the production cost of the polymer in question

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
  • Continuous slurry polymerization volatile removal
  • Continuous slurry polymerization volatile removal
  • Continuous slurry polymerization volatile removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] A typical ethylene polymerization process can be performed at a temperature of about 102°C (215°F) and 39.1×10 5 N m -2 (565psia) pressure. One instance of this process yields about 10.5kgs -1 (83 000lb / hr) of polymerization effluent, containing about 5.68kgs -1 (45 000lb / hr) polyethylene polymer solids and approx. 4.79kgs -1 (38 000 lb / hr) isobutane and unreacted monomers. Continuous discharge of polymerization effluent at a pressure of about 16.6×10 5 N m -2 (240psia) and temperature about 82°C (180°F) in the first flash tank and discharge about 4.4kgs from the top of the tower -1 (35 000 lb / hr) diluent and unreacted monomer vapors and entrained particles. An additional amount of heat is provided to the polymerization effluent by suitable heating means during transfer between the discharge valve and the first flash tank. After removing the fines, pass through without compression at about 16.6×10 5 N m -2 The isobutane vapor is condensed by heat exchange at a...

Embodiment 2

[0100] A typical ethylene polymerization process can be performed at a temperature of about 102°C (215°F) and 39.1×10 5 N m -2 (565psia) pressure. One instance of this process yields about 10.5kgs -1 (83 000lb / hr) of polymerization effluent, containing about 5.68kgs -1 (45 000lb / hr) polyethylene polymer solids and approx. 4.79kgs -1 (38 000 lb / hr) isobutane and unreacted monomers. Continuous discharge of polymerization effluent at a pressure of about 16.6×10 5 N m -2 (240psia) and temperature about 79°C (175°F) in the first flash tank and discharge about 2.9kgs from the top of the tower -1 (23 000 lb / hr) diluent and unreacted monomer vapors and entrained particles. After removing the fines, pass through without compression at about 16.6×10 5 N m -2 The isobutane vapor is condensed by heat exchange at a pressure of (240 psia) and a temperature of about 44°C (112°F). Polymer slurry / solids are discharged from the bottom of the first flash tank into a sealed chamber to f...

Embodiment 3

[0102] An example of a typical ethylene polymerization process is carried out in a 0.51m (20in) reactor with a settling branch with 8 pipes, the total length is 254m (833ft), and the volume is 43528dm 3 (11 500gal). The reactor is equipped with a single flash tank (requires 100% compression of all diluent exiting the reactor) and a 460-480kw circulation pump with a pump head in the range of 25.9 to 33.5m (85 to 110ft), Spawned between 1325 and 1766dm 3 the s -1 (21 000 to 28 000 gal / min (gpm)) range of circulation speed, operating in intermittent discharge mode. The polymerization temperature in the reactor is between about 101.7°C and 103.3°C (215°F to 218°F), and the pressure is 39.1×10 5 N m -2 (565 psia).

[0103] In the process of Example 3, the reactor slurry density ranged from 0.555 to 0.565 gm / cc and the polymer production rate was from 3.5 to 3.9 kgs -1 (28 000 to 31 000 lb / hr), while the weight percent of reactor solids concentration was maintained in the rang...

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

A process / apparatus is disclosed for continuously separating a liquid medium comprising diluent and unreacted monomers from a polymerization effluent comprising diluent, unreacted monomers and polymer solids, comprising a continuous discharge of the polymerization effluent from a slurry loop reactor through a discharge valve and transfer conduit into a first intermediate pressure flash tank with a conical bottom defined by substantially straight sides inclined at an angle to that of horizontal equal to or greater than the angle of slide of the slurry / polymer solids and an exit seal chamber of such diameter (d) and length (1) as to maintain a desired volume of concentrated polymer solids / slurry in the exit seal chamber such as to form a pressure seal while continuously discharging a plug flow of concentrated polymer solids / slurry bottom product of said first flash tank from the exit seal chamber through a seal chamber exit reducer with inclined sides defined by substantially straight sides inclined at an angle to that of horizontal equal to or greater than the angle of slide of the polymer solids which remain after removal of about 50 to 100 % of the inert diluent therefrom to a second flash tank at a lower pressure.

Description

field of invention [0001] The present invention relates to apparatus for the continuous separation of polymer solids from a liquid medium comprising an inert diluent and unreacted monomer in a slurry polymerization process. In particular, the present invention relates to apparatus for continuously separating polymer solids from a liquid medium, drying the polymer, and recovering the diluent and unreacted monomer, reducing the risk of condensation of diluent vapor into liquid diluent. to be reused for the compression required for the polymerization process. In another aspect, the invention relates to a process for the continuous separation of polymer solids from a liquid medium. In particular, the present invention relates to a process for continuously separating polymer solids from a liquid medium, drying the polymer, and recovering the inert diluent and unreacted monomer for reuse in the polymerization process. Background of the invention [0002] In many polymerization p...

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 Patents(China)
IPC IPC(8): B01J19/18B01J19/24B01J8/00C08F6/00B01D3/06B01J8/20B01J8/38C08F2/00C08F2/01C08F6/24C08F10/00C08F210/16
CPCB01J2219/002B01J8/005B01J8/382C08F10/00C08F210/16B01J2219/00236B01J2208/00867C08F6/24B01J2219/00114B01D3/06B01J8/0055C08F6/003B01J2208/00761B01J2208/0007B01J2208/00769B01J2219/00191B01J2219/00213B01J2219/0024B01J2219/00103B01J8/007B01J2208/00539B01J2219/00006B01J2219/00231B01J19/1837B01J8/003C08F2/14C08F210/14
Inventor J·A·肯德里克T·W·陶勒斯S·T·罗杰
Owner EXXONMOBIL CHEM PAT INC