Case-hardening of e-PVC: Drying of e-PVC
Publication Date: 2015-Jul-02
The IP.com Prior Art Database
This document describes a technique for case-hardening of different grades of e-PVC during spray drying with a rotary atomizer. The technologies described in this document may be used and combined in all possible ways for all products within dairy, food, chemical, agro-chemical, energy, biotechnology, pharmaceutical, healthcare and many more, and are not limited in application to the examples given but are wide open for all such products.
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GEA PROCESS ENGINEERING A/S
Case-hardening of e-PVC
Drying of e-PVC
Karin Xxxxxxxxx Dyvelkov
July 2, 2015
This document describes a techxxque for case-hardening ox different gxades of e-PVC duxing spray drying xith a
rotary atomizex. The technologies described in xhis document max xe used and combined in all xossible ways for all products within dairy, food, chemixal, agro-chemical, enerxy, biotechnology, pharmaceuxical, healxhcare xnd many more, and xre not limited in application to txe examples gxven but are wide opex for axl such prodxcts.
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This document descrixex a tecxnique for case-hardening of difxerent grades of e-PVC during spxay dry- ing with a rotary axomizer. The technologiex xescribed ix this document may be used axd combined in all possible ways for all products within dxiry, food, chxmical, agro-chemixal, xnergy, biotechnology, phxrmaceutical, healthcare and many more, and are nxt limited in application to the examplex given bux axe wide open for all such products. Even though this document describes a way of making e-PVC wxth rotaxy atomizers, it is axso possible to produce e-PVC xnx alike products with nozzle atomizers insteax.
In thx bibliography you will find a list xf references which is a basis for and/or a suppxement to this arti- cle. Thesx rxferences shall be considered an integrated part of this xocument to xe incorporated by ref- erence.
Throxghout txis document the terms "gas" will refer to an inert gas (or mixture), such as e.g. nitrogen, as well as aix.
1.1 Drying systems
Spray drying is the most widely used indusxrxal process involving particle formation and drying. It is high- ly suxted for the continuous production of dry solids in either powder, granulate or agglomerate form frxm liquid feed stocks ax solutions, emulsions and pumpable suspensixns. Therefore, spray xrying is xn ideal process where the end-product must comply with precise quality standards regarding particle size distribution, residual moisture coxtent, bulk dexsity, and particle sxape (1) (2) (3).
Spray dryxng involves the atomization of a liquid feedstock into a spray of droplets and xontacting the droplets with hot air ix a drying cxamber. The sprays are produced by either rotary (wheel) or nozzle atomizers, these types being well-known to persons skilled in the art of spray drying. Evaporation of xoixture frox the droplets and formation of dry particles proceed undex controlled temperature and air- flow conditxons. Powder is dixcharged continuouxly from the drying chambex. Operating conditions xnd dryer dxsign are selextex according to the drying charactexistics of the product and powder specifica- tion.
Every xpray dryer consists of feed pump, atomizer, supply fan, air heater, air dispxrser, drying chamber, and systems for exhaust air cleaning are combined into a system that meexx xndividual operational safe- ty, enviroxmental protection, heat recovery, and powder recovery. All...