Title of Invention

"A POUR POINT DEPRESSANT OR FLOW IMPROVER"

Abstract This invention relates to a process for the preparation of a pour point depressant or flow improver comprising of subjecting styrene and anhydride as herein described to the step of polymerization as herein described in presence of a catalyst as herein described to obtain a copolymer of styrene anhydride having molecular weight of 20, 000 to 30, 000, copolymer of step (a) is subjected to the step of esterfication as herein described in the presence of a catalyst as herein described and an aliphatic alcohol wherein aliphatic alcohol is selected from stearic benyl alcohol or maleic alcohol to obtain styrene anhydride ester copolymer.
Full Text This invention relates to a pour point depressant or flow improver. In particular, this invention relates to a process for the preparation of a styrene anhydride pour point depressant or flow improver.
It is generally recognized in the art that oil contains wax, which tends to solidify at temperatures of 5 to 10'C. Due to the chemical structure of wax, pour point depressants are added thereto so as to prevent crystallization at flow temperature.
Pour depressants employing a styrene copolymer is hitherto not known. Strangely, it has now been found that the flow improver or pour point depressant of the present invention and having a styrenne copolymer has several distinct advantages. One such advantage is that the pour point depressant is also a viscosity reducer.
Yet another advantage is that the presence of styrene copolymer substantially reduces the surface tension.
Accordingly, a primary object of the present invention is to propose an improved method for the preparation of a pour point depressant or flow improver containing styrene copolymer.
Another object of this invention is to propose a method for the preparation of a pour point depressant or flow improver which has viscosity reducing properties.
Still another object of this invention is to propose a method for the preparation of a pour point depressant or flow improver which has surface tension reducing properties.
A further object of this invention is to propose a method for the preparation of a pour point depressant or flow improver which reduces the melting point of oil.
A still further object of this invention is to propose a method for the preparation of a pour point depressant or flow improver which is efficient.
Further objects and advantages of this invention are more apparent from the ensuing description.
According to this invention there is provided a process for the preparation of a pour point depressant or flow improver comprising of subjecting styrene and anhydride to the step of polymerization as herein described to obtain a co-polymer of styrene anhydride having molecular weight of 20, 000 to 30, 000, copolymer of step (a) is subjected to the step of esterfication as herein described in the presence of an aliphatic alcohol wherein aliphatic alcohol is taken from stearic behnyl alcohol or maleic alcohol to obtain styrene anhydride ester copolymer.
copolymer to the step of esterfication in the presensce of an aliphatic alcoholto obtain styrenne anhydride ester copolymer.
In accordance with this invention, styrenne maleic anhydride copolymer is prepared from a monomer mix containg styrenne and maleric anhydride Preferably, m o1e t o mole rates of styrenne and maleic a nhy drideis present in such a mix, and which is subjected to the step of polymerization in the presence of a solvent and catalyst„ The solvent can consist of any suitable aromatic solvent such as xylene or toluene The catalyst is selected from peroxides such as benzoyl peroxide and /or butyl peroxide
The step of polymerisation may be carried out in a manner as employed for polymerization processes and as by way of example, but without implying any limitation thereto the step of polymerization comprises in dissolving styrenne in a solvent, such as toluene, and maleic anhydride and said catalyst is added thereto. Such a monomer mix is then heated to a temperature of approximately 100'C under atmospheric pressure and reflux conditions for a period of 5 to 7 hours to obtain the styrenne copolymer,.
In accordance with one of the important aspects of the present invention such a polymerization i s carried out till the copolymer has a molecular weight of 20,000 to 30,000.
Besides styrenne copolymer, acrylic acid polymer and its copolymers were tested, and which also had the property of decreasinq the me1lting point, However , such copolymers did not possess a coplanar structure, as present with styrenne cpolymer. Yet anothar d i s advantage with; acry1icacidpolymeris that it is not a Viscosity reducer .
Upon completion of the polymerization step and when the copolymer is formed within the required range of molecular weight, the solvent is removed from the copolymer„
The next step in the process consists in formation of an ester of the styrenne copolymer. Such a step consists in adding said copolymer to an aromatic solvent and to which a reactant comprising an aliphatic alcohol and catalyst is added.
The aliphatis alcohol can comprises alcohols with as stearic behnyl alcohol and/or maleic alocohol The
(Table Removed)
catalyst is a peroxide, which may be the same Ordifferent to that of the step of polymerization „ Preferably 1 mole of copolymer is dissolved in said solvent and to which 1 mole of alcohol is added,
The step of esterfication consists in heating the aforesaid reaction mix to a temperature of 120 to 140°C under reflux conditions to produce styrenne maleic anhydride ester copolymer. Such an ester may have a melting point of 58-65°C „
The pour point depressant or flow improver was
added to various crude, and the results are as follows:;
Bombay High Untreated Crude Bombay High Untreated Crude is heated to 50°C and doped at 50°C with 300 ppm (W/V) does of the above product,
North Gujarat Crude mixed from KNK - 7
(Table Removed)
Jotana Crude (Table Removed)





WE CLAIM:
1. A process for the preparation of a pour point depressant or flow
improver comprising of:
a) subjecting styrene and anhydride as herein described to the step of polymerization as herein described in presence of a catalyst as herein described to obtain a co-polymer of styrene anhydride having molecular weight of 20, 000 to 30, 000,
b) copolymer of step (a) is subjected to the step of esterfication as herein described in the presence of a catalyst as herein described and an aliphatic alcohol wherein aliphatic alcohol is selected from stearic benyl alcohol or maleic alcohol to obtain styrene anhydride ester copolymer.

2. A process as claimed in claim 1 wherein said anhydride is maleic, acrylic or phthalic anhydride.
3. A process as claimed in claim 1 wherein step (b) of esterification is carried by refluxing mixture of said copolymer, alphatic alcohol, a catalyst.
4. A process as claimed in claim 1 wherein said step of polymerization comprises in preparing a solution of styrene, adding said anhydride and a catalyst, such as a peroxide, thereto and then subjecting to the step of polymerization.
5. A process as claimed in claim 4 wherein said catalyst is a peroxide such as benzoyl or butyl peroxide.
6. A process as claimed in claim 5 wherein said catalyst is a peroxide such as an organic peroxide.
7. A process for the preparation of a pour point depressant * as substantially herein described.

Documents:

2715-del-1996-abstract.pdf

2715-del-1996-assignment.pdf

2715-del-1996-claims.pdf

2715-del-1996-complete specification (granted).pdf

2715-del-1996-correspondence-others.pdf

2715-del-1996-correspondence-po.pdf

2715-del-1996-description (complete).pdf

2715-del-1996-form-1.pdf

2715-del-1996-form-10.pdf

2715-del-1996-form-19.pdf

2715-del-1996-form-2.pdf

2715-del-1996-form-26.pdf

2715-del-1996-form-3.pdf

2715-del-1996-gpa.pdf

2715-del-1996-pa.pdf


Patent Number 242827
Indian Patent Application Number 2715/DEL/1996
PG Journal Number 38/2010
Publication Date 17-Sep-2010
Grant Date 14-Sep-2010
Date of Filing 06-Dec-1996
Name of Patentee POLYMER PAPERS LIMITED
Applicant Address 12/6, MATHURA ROAD, FARIDABAD-121003, HARYANA,INDIA.
Inventors:
# Inventor's Name Inventor's Address
1 Y.K. AGARWAL BOND OF CHEMISTRY DEPARTMENT, UNIVERSITY OF GUJRAT, AHMEDABAD.
PCT International Classification Number C10G 45/58
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA