Patent ID: 11932553
Assignee: VERSUM MATERIALS US, LLC
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 0:
1. A method of purifying a solid phase raw material comprising tungsten chloride and at least one impurity, wherein the at least one impurity is neither iron chloride nor aluminum chloride, comprising:
(a) heating the solid phase raw material in a first vessel to a first temperature range to produce a heated raw material;
(b) contacting the heated raw material with a getter, which results in a reaction between the getter and a reactive portion of the at least one impurity to produce at least one complexed impurity and produces a first intermediate product, comprising tungsten chloride, an unreactive portion of the at least one impurity, and the at least one complexed impurity, and the getter is selected from the group consisting of: potassium chloride, sodium chloride, rubidium chloride, cesium chloride, calcium chloride, magnesium chloride, barium chloride, and combinations thereof;
(c) performing a separation process on the first intermediate product which results in at least a portion of the at least one complexed impurity being separated from the tungsten chloride and the unreactive portion of the at least one impurity to produce a second intermediate product, the separation process selected from the group consisting of: distillation and sublimation;
(d) cooling the second intermediate product to within a second temperature range, which results in at least a portion of the unreactive portion of the at least one impurity being separated from the tungsten chloride to produce a product, wherein the product is enriched in tungsten chloride relative to the solid phase raw material and the second intermediate product;
wherein steps (a) through (d) are performed within a first pressure range; and
wherein the first pressure range comprises from 14.7 to 25 pounds per square inch absolute, the first temperature range comprises from 250 to 400 degrees Celsius, and the second temperature range comprises from 130 to 250 degrees Celsius;
or wherein the first pressure range comprises from 100 to 500 torr absolute, the first temperature range comprises from 200 to 300 degrees Celsius, and the second temperature range comprises from 60 to 200 degrees Celsius;
or wherein the first pressure range comprises less than 1 torr absolute, the first temperature range comprises from 130 to 250 degrees Celsius, and the second temperature range comprises from 130 to 250 degrees Celsius.