Anti-scaling agent for coating of polymerization reactors

Details Anti-scaling agent for coating of polymerization reactors Anti-scaling agent for coating of polymerization reactors

1998-02-13

2000-05-30

Truong, Duc

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524155, 524324, 524354, 524457, 524508, 524509, 524512, 524540, 524542, 526 62, 526208, 526222, 252175, C08J 5100, C08K 5100, C08L 5100

Patent

active

060691999

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

My invention relates to a anti-scaler for coating polymerizing reactors.
Anti-scaling agents by polymerizing reactors are already well known in the prior art.


BACKGROUND ART

In the present art there are also different types of anti-scalers for each type of polymer.
For example the anti-scaler for the production of vinyl chloride is not the same as that used in the reactor for the production of polystyrene or of that for the production of acrylic polymers, and so on.
This fact necessitates in the storing of different products with all the consequences of high management costs.
Additionally even the reactors must be specifically dedicated to only one reaction type, resulting in the increase of costs.


DISCLOSURE OF INVENTION

A first aim of this invention is that to make an anti-scaler that operates well in any type of polymerizing reactor and for the most varied types of different materials, therefore for vinyl chloride, as well as for styrene and acrylic polymers, etc.
In the specific case of 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 monomer chloride (VCM) immissions into the atmosphere; respective polymerized product with consequent worsening in quality and complaints of the users; 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 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 same product.
Furthermore it is to be noted that the material particles that detach from the crust of the 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 from polycondensation of naphthols with a aldehydic cross-linking product (eg. . . formaldehyde and others), to obtain anti-scaling products is known.
For this purpose one refers to: disclosed on Jun. 13, 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 condensate anti-scalers parting from the formaldehyde and naphthols combination. agent 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 poliarilphenol family. 1978) explains furthermore the importance of using as anti-scalers, products that in their chemicals structure contain one or more of the following groups: --OH; --COOH; SO3H and SO3Na. These groups are usually attached to an aromatic nucleus. differs for the fact that the formaldehyde is made to react with 1-naphthol (alpha-naphthol) effective in both the nuclear positions 2 and 4 are not replaced and the nuclear position 3 is not replaced or has a substitute that is not strongly eletron-attractor to obtain a condensate.
It is also opportune to note that the use of the naphthols is already suggested from the U.S. Pat. No. 3,669,946, therefore it was obvious to use 1-naphthol in the preceding process in place of the phenols as mentioned.
Even in this case the product obtained according to the chemistry is to be considered always as pertinent to the poliarilphenol family.
JP-A-5-230 112 refers to a condensation product based on an aromatic amine and aromatic hydroxy compounds and are prepared with use of reaction terminators. In particular it is suggested to use a MNeOH solution of 4-aminodiphenylam

REFERENCES:
patent: 3669946 (1972-06-01), Koyanagi et al.
patent: 3825434 (1974-07-01), Berens et al.
patent: 4068059 (1978-01-01), Witenhafer

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