KR920701260A - Scale prevention of polymerization reactor - Google Patents

Abstract

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Scale prevention of polymerization reactor

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Claims (42)

A method of polymerizing a vinyl chloride monomer and an optional ethylene-unsaturated comonomer at a ratio of about 80 mole% or less comonomer based on the total monomer content is characterized in that the polymerization in the presence of a compound of the general formula or structural formula How to. Wherein R is -CH ₃ or to be. A method of polymerizing a vinyl chloride monomer and an optional ethylenically unsaturated comonomer at a ratio of about 80 mol% or less based on the total monomer content, characterized in that the polymerization is carried out in the presence of the following general formula composition. Way. Wherein the average value of n is from about 1 to about 5 and R is -CH ₃ or to be. A suspension polymerization method for polymerizing vinyl chloride with polyvinyl chloride, wherein the polymerization is carried out in the presence of a compound of the following general formula or structural formula. Wherein R is -CH ₃ or to be. A suspension polymerization method for polymerizing vinyl chloride with polyvinyl chloride, wherein the polymerization is carried out in the presence of a composition of the following general formula. Wherein n averages about 1 to about 5 and R is -CH ₃ or to be. The method of claim 4, wherein the solution of the composition in the solvent is coated on the wall of the polymerization zone. The method of claim 4 wherein the composition is added to the polymerization zone at a solids ratio of about 0.0001 to about 0.01 weight percent based on the weight of vinyl chloride and comonomer. An emulsion polymerization method for polymerizing vinyl chloride with polyvinyl chloride, wherein the polymerization is carried out in the presence of a compound of the following general formula or structural formula. Wherein R is -CH ₃ or to be. A process for emulsion polymerization in which vinyl chloride is polymerized with polyvinyl chloride, wherein the polymerization is carried out in the presence of a composition of the following general formula. ) Wherein n averages about 1 to about 5 and R is -CH ₃ or to be. The method of claim 8, wherein the solution of the composition in the solvent is coated on the wall of the polymerization zone. The method of claim 8, wherein the composition is added to the polymerization zone at a solids ratio of about 0.0001 to about 0.01 weight percent based on the weight of vinyl chloride and comonomer. A microsuspension polymerization method for polymerizing vinyl chloride with polyvinyl chloride, characterized in that the polymerization is carried out in the presence of a compound of the following general formula or structural formula. Wherein R is -CH ₃ or to be. A method of microsuspension polymerization in which vinyl chloride is polymerized with polyvinyl alcohol, wherein the polymerization is carried out in the presence of a composition of the following general formula. Wherein n averages about 1 to about 5 and R is -CH ₃ or to be. The method of claim 12, wherein the solution of the composition in the solvent is coated on the wall of the polymerization zone. The process of claim 12 wherein the composition is added to the polymerization zone at a solids ratio of about 0.0001 to about 0.01 weight percent based on the weight of vinyl chloride and comonomer. 12. The method of claim 11, wherein the microsuspension polymerization is carried out in a tubular region without stirring. 13. The method of claim 12, wherein the microsuspension polymerization is carried out in a tubular region without stirring. The method of claim 13, wherein the microsuspension polymerization is carried out in a tubular region without stirring. 15. The method of claim 14, wherein the microsuspension polymerization is carried out in a tubular region without stirring. A bulk polymerization method for polymerizing vinyl chloride with polyvinyl chloride, wherein the polymerization is carried out in the presence of a compound of the following general formula or structural formula. Wherein R is -CH ₃ or to be. A bulk polymerization method for polymerizing vinyl chloride with polyvinyl chloride, wherein the polymerization is carried out in the presence of a composition of the following general formula. Wherein the average value of n is from about 1 to about 5 and R is -CH ₃ or to be. The method of claim 16, wherein the solution of the composition in the solvent is coated on the wall of the polymerization zone. The method of claim 16 wherein the composition is added to the polymerization zone at a solids ratio of about 0.0001 to about 0.01 weight percent based on the weight of vinyl chloride and comonomer. A process for preparing a dimer of phenothiazine and acetaldehyde or benzaldehyde, characterized by reacting phenothiazine and acetaldehyde or benzaldehyde in the presence of a liquid diluent that is a solvent for phenothiazine but is a non-solvent for dimers. . The method of claim 23, wherein the process is performed in the presence of a strong acid. The method of claim 24, wherein the strong acid is hydrochloric acid or sulfuric acid. The method of claim 23, wherein the diluent is an alcohol. The method of claim 26, wherein the alcohol is isopropanol. The method of claim 23, wherein the diluent is a mixture of polar and nonpolar solvents. The method of claim 28, wherein the diluent is a mixture of tetrahydrofuran and methanol. The method of claim 28, wherein the diluent is a mixture of dimethylformamide and methanol. The method of claim 23, wherein acetaldehyde or benzaldehyde is slowly added to the reaction mixture of phenothiazine and diluent. Phenothiazine is reacted with acetaldehyde or benzaldehyde in the presence of isorpanol and hydrochloric acid, where acetaldehyde or benzaldehyde is slowly added to the reaction mixture of phenothiazine and isopropanol. Method of preparing the composition. Wherein R is -CH ₃ or to be. The mean value of n is about 1 to about 2. A process for preparing acetylphenothiazine and formaldehyde, characterized by reacting a dimer of acetylphenothiazine and formaldehyde in the presence of a liquid diluent that is a solvent for acetyl phenothiazine but is a non-solvent for dimers. The method of claim 33, wherein the process is performed in the presence of a strong acid. 35. The method of claim 34, wherein the strong acid is hydrochloric acid or sulfuric acid. The method of claim 33, wherein the diluent is an alcohol. The method of claim 36, wherein the alcohol is isopropanol. The method of claim 33, wherein the diluent is a mixture of polar and nonpolar solvents. The method of claim 38, wherein the diluent is a mixture of tetrahydrofuran and methanol. The method of claim 38, wherein the diluent is a mixture of tetrahydrofuran and methanol. The method of claim 33, wherein formaldehyde is slowly added to the reaction mixture of acetyl phenothiazine and diluent. Acetylphenothiazine is reacted in the presence of formaldehyde, isopropanol and hydrochloric acid, wherein the formaldehyde solution is slowly added to the reaction mixture of acetylphenothiazine and isopropanol to prepare a composition of the general formula . Wherein the mean value of n is from about 1 to about 2. ※ Note: The disclosure is based on the initial application.