MXPA96003365A - Moisturizing and suction reducing composition, used in raw oil tanks in refiner - Google Patents

Abstract

The present invention relates to a humectant and salt reducing composition used in crude oil storage tanks in a refinery, characterized in that it comprises: 20-50% volume of a pluracol of molecular weight of 3000 - 6000 g-mol, 20-50 % volume of a polymerized polyol of 8000 - 12000 g-mol and 40-60% by volume of an aromatic solvent as a vehicle

Description

MOISTURIZING AND SUCTION REDUCING COMPOSITION, USED IN RAW OIL STORAGE TANKS IN REFINERIES.

DESCRIPTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a humectant and salt reduction composition used in crude oil storage tanks in refineries, basically constituted by the combination of several chemical products that considerably reduce the salt and inorganic sediments content of the crude oils that reach the refineries.

The composition comprises the following components: a humectant and oil cleaner, a water coalescer and cleaner and an aromatic carrier.

BACKGROUND OF THE INVENTION Mixtures of different crude oils that reach refineries can vary in their Mayan crude content from 10 to 40% in volume, which considerably increases the specific weight of the mixture, this makes the desalting and dehydration treatment more difficult and delayed, in addition to this, the sediment and salt remain occluded in the form of an emulsion, so it is necessary to dose wetting, breaking and coalescing additives that make it possible to carry out as quickly as possible the separation of water, sediment and salt, which allows to reach the oil clean crude to the refining processes to which they are subjected, avoiding corrosion in equipment and pipes.

Under these concepts, the invention provides an additive that solves the above problems, constituting an optimum material composition, which reduces the harmful factors more efficiently, compared to conventional compositions.

The present invention provides an improved additive for wetting the sediments, breaking down the emulsion and lowering the salt content of the crude oil blends arriving at the refineries, whose novelty lies in the combination of compounds that differ from the current additives in terms of its formulation for which the evaluation of each of the additives was carried out in tests at laboratory level, to select the optimal components such as emulsion breaker, coalecedor, salt reducer. With this new formulation, an improvement in behavior and economy is also achieved, compared to conventional compositions Therefore, the present invention provides an improved wetting composition for blends of crude to wet the sediments.

Furthermore, the present invention provides an emulsion breaker composition for obtaining clean crude mixtures without water at lower cost and higher efficiency than the known additives.

On the other hand, the invention also provides an improved additive for mixtures of crude oils, which helps to reduce the salt that is occluded in the crude oils with which the mixtures that are processed in refineries are formed.

The foregoing and other objects of the invention are set forth with greater clarity and detail in the following chapters of the present patent description, wherein the best method known to the owner is established, to carry out the invention.

DETAILED DESCRIPTION OF THE INVENTION The emulsifier emulsifier and salt reducer for crude oil mixtures has the following formulation with the volume ratios of its components: 20 to 50% by volume of a Pluracol with a molecular weight of 3000 - 6000 g-mol as a breaker of emulsion, water cleaner and desalter; 20 to 50% by volume of a polymerized polyol of molecular weight of 8000-12000 g-mol as a water desalter and cleaner; 30 to 60% by volume of an aromatic solvent as a diluent.

The process by which the improved emulsifier, emulsion breaker and salt reducer for crude oil blends described above is obtained, comprises the following steps: in a container equipped with stirring and heating means, the emulsion breaker is placed heat, at appmately 50 ° C, then place the water softener and cleaner, stir homogeneously for a period of 60 min., the heating is cut off and then the diluent is added, the addition is continued until a perfectly homogeneous mixture is obtained of the 3 components.

To carry out the evaluation of the humectant additive, emulsion breaker and salt reducer so prepared, bottle tests and crude mixtures were used, whose specific weight varies from 0.87-0.920. The evaluation technique is described below in the following examples. which are provided in a more non-limiting explanatory manner of the practical embodiment of the invention.

EXAMPLES EXAMPLE01 With adapted stirring and heating means in a vessel, a mixture at 50 ° C of 70% by volume of an aromatic solvent with 15% by volume of a polymerized polyol and 15% of a high molecular weight pluracol is prepared, obtaining a transparent yellow product, stable.

To evaluate the efficiency of the product as) obtained, the bottle test method was used, which will simulate a settling tank, in which 100 ml are placed. of the crude oil to be treated, the product obtained previously is added, stirred and left to stand for 6 to 24 hours at room temperature (depending on the specific weight of the crude oil) at the end of the time a 10 ml sample is taken. of the crude oil, the salt content is determined and the separation of water and sediment is observed.

During the evaluation thus carried out, the following results were obtained.

Original raw sai content 58 LMB Raw salt content after 6 hours of rest s / additive 50 LMB Salt content with 10 ppm. deaditive after 6 hours of rest 40 LMB EXAMPLE 2 Following the technique of Example 1, but using the following proportions of ios components: 60% aromatic solvent 30% polymerized polyol 10% pluracol of high molecular weight.

The product obtained is a stable transparent yellow liquid easy to handle.

The results obtained were: Original raw salt content 58 LMB Raw salt content after 6 hours of rest s / additive 50 LMB Raw salt content with 10 ppm. of additive with 6 hrs of rest 40 LMB EXAMPLE 3 Following the technique of the additive, but using the following proportions of ios components 50% aromatic solvent % polymerized polyol % high molecular weight pluracol.

The product obtained is a transparent, slightly yellow, stable liquid of easy management, presents the following characteristics.

Specific weight 20/4 ° C 0.943 Temp. of inflammation, ° C 40 Temp. of freezing, ° C < - 42 Kinematic viscosity at 37.8 ° C, cSt. 26 The results obtained during the evaluation were: Original raw salt content 58 LMB Raw salt content after 6 hours of rest s / additive 50 LMB Crude salt content with 10 ppm of additive after 6 hrs of rest 24 LMB In all the examples, separation of water and inorganic sediment was obtained.

The results stated in the evaluation, which are indicated in the preceding examples, the humectant and salt-reducing composition, for crude oils in refineries object of the present invention, are highly efficient for use in crude oil storage tanks.

Claims (4)

NOVELTY OF THE INVENTION Having described the invention, it is considered as a novelty and therefore, it is claimed as, property contained in the following clauses.

1. - A moisturizing and reducing salt composition used in crude oil storage tanks in a refinery, characterized "because it comprises: 20-50% volume of a pluracol of molecular weight of 3000 - 6000 g-mol; 20-50% volume of a polymerized polyol of 8000 - 12000 g-mol and 40-60% by volume of an aromatic solvent as a vehicle.

2. - A composition according to clause 1, characterized in that it comprises: 25% of a pluracol of molecular weight of 3000 - 6000 g-mol as water cleaner, breaker and salt reducer.

3. - A composition according to clause 1, characterized in that it comprises: 25% of a polymerized polyol of molecular weight of 8000-12000 g-mol as a water blender and salt reducer and sediment humectant.

4. - A composition in accordance with clause 1, characterized because It comprises 50% of an aromatic solvent to facilitate its handling and incorporation into the crude when being dosed. In testimony of which I sign the present in Mexico City, D.F., of August 1996. MEXICAN INSTITUTE OF OIL LIC. ENRIQUE A. MARTÍNEZ -CAÑEDO Legal Manager