Lei Zhang Zhang

US Patent:

20200109053, Apr 9, 2020

Filed:

Oct 2, 2019

Appl. No.:

16/590885

Inventors:

- Princeton NJ, US
Lei Zhang - Stamford CT, US

Assignee:

CYTEC INDUSTRIES INC. - Princeton NJ

International Classification:

C01B 25/232
B01D 19/04

Abstract:

A wet process phosphoric acid production method comprises digesting phosphate-containing ore in a slurry comprising sulfuric acid, whereby phosphoric acid and calcium sulfate crystals are formed; and separating the phosphoric acid from the calcium sulfate crystals; wherein a defoamer and a poly(carboxylic acid), or salt thereof, having a weight-average molecular weight of less than 1,000,000 grams per mole (g/mol), are added to the slurry. The poly(carboxylic acid) can be a poly(acrylic acid), or salt thereof, and the defoamer can be a dialkyl sulfosuccinate salt and an aliphatic alcohol or a fatty acid ester. The method enhances separation of phosphoric acid from calcium sulfate crystals in wet process phosphoric acid production by any one of increasing the volume average particle size of the calcium sulfate crystals, increasing filtration rate, and reducing foam formation.

US Patent:

20190177164, Jun 13, 2019

Filed:

Feb 20, 2019

Appl. No.:

16/280218

Inventors:

- Princeton NJ, US
Lei ZHANG - Stamford CT, US

Assignee:

Cytec Industries Inc. - Princeton NJ

International Classification:

C01B 25/235
C01F 11/46
C08F 20/06
C08F 20/56
C02F 1/00
C02F 1/56
C01B 25/222

Abstract:

Processes for enhancing filtration rate and/or clarification of phosphoric acid produced by the wet process and containing suspended insoluble particulates by adding to one or more stage of the wet process phosphoric acid production stream an effective amount of a reagent including polymeric microparticles characterized as being anionic or amphoteric and having a weight average molecular weight of greater than 60 Million daltons are provided herein.

US Patent:

20170057822, Mar 2, 2017

Filed:

Sep 1, 2016

Appl. No.:

15/254617

Inventors:

- Woodland Park NJ, US
Lei Zhang - Stamford CT, US

Assignee:

Cytec Industries Inc. - Woodland Park NJ

International Classification:

C01B 25/235
B01D 21/01
C08F 20/56
C01B 25/222
C08F 20/06

Abstract:

Processes for enhancing filtration rate and/or clarification of phosphoric acid produced by the wet process and containing suspended insoluble particulates by adding to one or more stage of the wet process phosphoric acid production stream an effective amount of a reagent including polymeric microparticles characterized as being anionic or amphoteric and having a weight average molecular weight of greater than 60 Million daltons are provided herein.

US Patent:

20160237599, Aug 18, 2016

Filed:

Jun 23, 2014

Appl. No.:

15/053070

Inventors:

- Spartanburg SC, US
Lei ZHANG - Stamford CT, US

International Classification:

D03D 15/12
D03D 1/00
D03D 13/00

Abstract:

An enhanced char integrity fabric containing a plurality of warp yarns in the warp direction and a plurality of weft yarns in the weft direction. The warp yarns and the weft yarns contain thermoplastic fibers having a melting temperature less than about 300 C. The enhanced char integrity fabric also contains a plurality of char reinforcing yarns in at least the warp direction. The char reinforcing yarns have a different composition than the warp yarns and the weft yarns and contain non-melting fibers having a decomposition temperature greater than 300 C. The char reinforcing yarns are in an amount of less than about 30% wt of the warp yarns and the tensile strength of the char reinforcing yarns is about equal or less than the tensile strength of the warp yarns.

US Patent:

20160176995, Jun 23, 2016

Filed:

Dec 15, 2015

Appl. No.:

14/969918

Inventors:

- Woodland Park NJ, US
Lei Zhang - Stamford CT, US
Douglas Cywar - Danbury CT, US
Matthew Taylor - New York NY, US

Assignee:

Cytec Industries Inc - Woodland Park NJ

International Classification:

C08F 126/02
C02F 1/68

Abstract:

Silicon containing polyamine scale inhibitors derived from poly(primary amine)s are disclosed. The scale inhibitors can be used to reduce siliceous scale formation in industrial process streams such as alumina recovery process streams, nuclear waste streams and kraft paper mill effluent streams.