# US 2019/0375863 A1 · A process for removing chloride from a polymer melt

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- Number: US 2019/0375863 A1
- Document ID: US20190375863A1
- Status: Published application
- Kind: A1
- Application number: 16/481,260
- Filed: 2018-01-06
- Published: 2019-12-12
- Earliest claimed: 2017-02-03
- Assignees: Reliance Industries Limited
- Applicants: Reliance Industries Limited
- Inventors: Vijayalakshmi Ravi Puranik; Kalpeshkumar Bhikhubhai Sidhpuria
- Web page: https://patentgrep.com/patent/US20190375863A1

## CPC

- C08F 6/28: Purification
- B01D 15/02: with moving adsorbents
- B01D 15/08: Selective adsorption, e.g. chromatography
- C08F 6/02: Neutralisation of the polymerisation mass, e.g. killing the catalyst (short-stopping C08F2/42 ){also removal of catalyst residues}
- C08F 10/02: Ethene
- C08F 10/06: Propene
- C08F 20/00: Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- B01D 2253/104: Alumina
- B01D 2253/108: Zeolites
- B01D 2253/1124: Metal oxides
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

The present disclosure provides a process for removing chloride from a polymer melt using at least one adsorbent. The adsorbent is selected from a metal oxide mixture, a mixture of alumina and hydrotalcite, crystalline fajausite zeolite and alumina doped with at least one metal. The process of the present disclosure is carried out at a temperature in the range of 260° C. to 280° C., and at a pressure in the range of 120 bar to 160 bar for time period in the range of 12 hours to 200 hours. The amount of chloride adsorbed on the adsorbent is in the range of 0.1% to 6.0% w/w.

## Claims

### Claim 1

A process for removing chloride from a polymer melt using at least one adsorbent, the process comprising the following steps:
dissolving the polymer melt containing chlorides with at least one fluid medium to form a polymer melt solution;
extracting the chlorides from the polymer melt solution by adsorbing chlorides on at least one adsorbent that is contacted with the polymer melt solution at a predetermined temperature to obtain a resultant mixture containing treated polymer melt solution and adsorbent with adsorbed chloride; and
separating the adsorbent with adsorbed chloride from the resultant mixture to obtain a polymer melt solution with reduced chloride content.

### Claim 2 (depends on 1)

The process as claimed in claim 1, further involves the step of separating the fluid medium from the polymer melt solution with reduced chloride content, wherein the separation is carried out by evaporation of the fluid medium under reduced pressure.

### Claim 3 (depends on 1)

The process as claimed in claim 1, wherein the polymer melt is at least one selected from the group consisting of polyethylene melt, and polypropylene melt.

### Claim 4 (depends on 1)

The process as claimed in claim 1, wherein the adsorbent comprises a metal oxide mixture and a binder, the metal oxide mixture comprises metal oxides selected from the group consisting of zinc oxide, calcium oxide, magnesium oxide, and aluminum oxide.

### Claim 5 (depends on 1)

The process as claimed in claim 1, wherein the adsorbent is a mixture of alumina and hydrotalcite.

### Claim 6 (depends on 1)

The process as claimed in claim 1, wherein the adsorbent is crystalline fajausite zeolite.

### Claim 7 (depends on 1)

The process as claimed in claim 1, wherein the adsorbent is alumina doped with at least one alkaline earth metal selected from the group consisting of lithium, sodium, potassium, cesium, and rubidium.

### Claim 8 (depends on 1)

The process as claimed in claim 1, wherein the amount of the polymer melt in the polymer melt solution is in the range of 5 weight % to 25 weight %.

### Claim 9 (depends on 1)

The process as claimed in claim 1, wherein the weight ratio of the adsorbent to the polymer melt is in the range of 1:1000 to 20:1000.

### Claim 10 (depends on 1)

The process as claimed in claim 1, wherein the fluid medium is selected from the group consisting of cyclohexane, and normal paraffin fluids.

### Claim 11 (depends on 1)

The process as claimed in claim 1, wherein the predetermined temperature is in the range of 200° C. to 300° C.

### Claim 12 (depends on 1)

The process as claimed in claim 1, wherein the step of extracting chlorides from the polymer melt solution is carried out at a pressure is in the range of 120 bar to 160 bar.

### Claim 13 (depends on 1)

The process as claimed in claim 1, wherein the step of contacting is carried out for a time period in the range of 12 hours to 200 hours.

### Claim 14 (depends on 1)

The process as claimed in claim 1, wherein the amount of chloride adsorbed by the adsorbent is in the range of 0.1% to 6.0% w/w.