Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including specific material of construction
Patent
1998-03-12
1999-10-12
Lovering, Richard D.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
Including specific material of construction
252176, 252178, 427318, 4273882, 428463, 5253288, 5253304, 525346, 526 62, B01J 1902, B05D 302, B05D 310
Patent
active
059650940
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The object of this invention is a polymerization process with anti-scaling agent for polymerizing of monomers in suspension or aqueous emulsion carried out in reactors (vessels) inside the walls of which an anti-scaling agent coating has been deposited capable of eliminating any scale formation or polymer film, and a process that leads to a composition of colourless and effective coating for the entire duration of the polymerization reaction.
Anti-scaling agents for polymerizing reactors and their application techniques are already well known in prior art.
BACKGROUND ART
At the present state of the art there are also different types of anti-scalers, (by anti-scaler or anti-scalers, anti-scaling agents is intended) for each type of polymer and for each of these there are different methods of application to form an anti-scaling coating on the inside of the reactors themselves.
For example the anti-scaler and its application technique for the polymerization of the vinyl chloride is not the same as that used in the reactor for the production of polystyrene or for the production of acrylic polymers, and so on.
This fact necessitates in the storing of various products, spraying and application devices with all the consequences of high management costs.
DISCLOSURE OF INVENTION
A first aim of this invention is to make an anti-scaler and a simple application technique that operates well in any type of polymerizing reactor and for the most varied types of different materials, therefore for polystyrene as well as for acrylic polymers, ABS, polyurethane and Polyvinylchloride, etc.
In the specific case of polymerization in aqueous suspension and of polymerization in aqueous emulsion of the vinyl chloride for example, it is known that in the reactors, a substantial deposit of scale forms having as main drawbacks: interruption of the production, opening of the reactor and therefore high quantities of gaseous vinyl chloride monomer (VCM) emissions into the atmosphere; respective polymerized product with consequent worsening in quality and complaints by the users; ecological problems for the areas in which the industrial Polyvinylchloride plants (P.V.C.) operates.
This problem practically exists for all types of polymerizations.
Furthermore the anti-scaling products (agents) destined to coat the surfaces of the respective reactors are of a bluish colour or dark brown nearly black, wherefore the particles that detach from the crust, pollute the obtained polymer (for example obtained polyvinyl chloride) from the reactor under the form of black dots, that for example in the finished products worsens the qualitative aspect of the said product.
Furthermore it is to be noted that the material particles that detach from the crust of the reactor wall, end up in the product in reaction, constituting the pollution of the same, dealing generally with toxic products.
In prior art, the technique of condensation or polycondensation of naphthols and phenol with an aldehyde cross-linking product (e.g. formaldehyde and others), to obtain anti-scaling products is known.
For this purpose one refers to: Jun. 13th, 1972), that suggests the use of formaldehyde and ketonic composites, naphthol etc. and also alpha-naphthylamine and nigrosin. This teaching predivulges the general concept of forming anti-scalers condensate parting from the formaldehyde with phenols and naphthols derivatives. for the polymerizing of vinyl chloride, obtained from the condensation of the phenol with formaldehyde, where obviously for definition in this patent the obtained product is always classified as pertinent to the phenol-formaldehyde or polyarylphenol family. 1978) explains furthermore the importance of using as anti-scalers, products that in their chemical structure contain one or more of the following groups: --OH; --COOH; SO3H and SO3Na. These groups are usually attached to an aromatic nucleus. formed with formaldehyde that is made to react with 1-naphthol (alpha-naphthol), in which both the nuclear positions 2 and 4 are not replaced and
REFERENCES:
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patent: 3669946 (1972-06-01), Koyanagi et al.
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patent: 3825434 (1974-07-01), Berens et al.
patent: 4007320 (1977-02-01), Peterson
patent: 4068059 (1978-01-01), Witenhafer
patent: 4976997 (1990-12-01), Stockel et al.
patent: 5037483 (1991-08-01), Dubin
patent: 5194301 (1993-03-01), Boscan-Romero et al.
patent: 5278022 (1994-01-01), Wade et al.
C.I.R.S. S.p.A.
Lovering Richard D.
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