RU2049805C1 - Method for production of food wax of products of oil refining - Google Patents

Abstract

FIELD: production of mineral waxes. SUBSTANCE: mixture of petrolatum with filtrate of removing grease of petrolatum and gatch fraction mixture is used as raw materials, quantities of said components being 20-40 and 60-90 mass respectively. Mentioned above gatch fraction has temperature 380-500 C, mass ratio of petrolatum and said fraction being (10-30):(70-90). Origin mixture is heated to 70-75 C and diluted with solvent to ratio 1:(3-9). Mixture of methylethyl ketone with toluene at ratio (40-70):(60-30) is used as said solvent. Thus treated raw materials are crystallized at 0-5 C, product which is obtained during crystallization being gradually filtered and solvent being distilled of precipitate. Yield of desired product is 30-40 mass as calculated for raw materials. Thus prepared wax has high plasticity which retains at temperatures less than 30 C. EFFECT: improves efficiency of method. 3 tbl

Description

 The invention relates to methods for producing mineral waxes from refined products. Obtained according to the claimed method, mineral wax after sulfuric acid contact cleaning is intended for use in the food industry, in particular as a component of a wax composition for coating cheeses.

 The method can be implemented at refineries.

 A known method of producing food paraffins used in a composition for coating cheeses (SKF-15) from gache mixtures obtained by dewaxing a base of hydraulic oil, IS-20 oil and rectified from IS-45 gach using a vacuum distillation unit.

 The method includes the following operations.

Dilution of raw materials with a temperature of 65-75 ^o With a solvent (mixture of methyl ethyl ketone: toluene (55-65) :( 35-45) in a ratio of 1: (10-14), crystallization by cooling the mixture to a temperature of 5-10 ^o C, separation of the precipitate oil-free paraffin by filtration and distillation of the solvent from the precipitate.

 The crude paraffin obtained after deep de-oiling the initial mixture is subjected to hydrotreating, and then contact post-treatment on Zikeev clay.

However obtainable by this method the desired product has a relatively low quality, since at ³⁰ ° C and lower loses ductility.

 A known method of producing BH wax, used after sulfuric acid-contact cleaning in the food industry as a component of an alloy for coating cheeses brand SDS-13M.

As raw material for the wax in the present process the target is introduced from the filtrate deoiling petrolatum mixture gas fraction 380-500 ^C in a weight ratio (10-30) :( 70-90).

The method includes the following operations: dilution of the raw materials before the first filtration step with a selective solvent of the composition (in volumetric) IEC + acetone: toluene + benzene (40-70) :( 60-30) in the ratio of raw materials: solvent 1: (3-9); crystallization or cooling the mixture to 0-25 ^{° C,} separating wax precipitate stepwise filtration and the solvent was distilled off from the precipitate.

The disadvantages of this method are:
a relatively low yield of the target product (25 wt. from the feedstock);
limited raw material base of the target filtrate;
the relatively low quality of the target product (at temperatures below 30 ^about With wax loses its ductility).

The claimed invention is aimed at solving the following problem:
expansion of the raw material base;
increase in equipment productivity;
improving the quality of the target product.

The technical result achieved by using this method:
more qualified use of petrolatum, a significant part of which is currently used as boiler fuel;
increase the yield of the target product;
improving the ductility of the target product.

The inventive method involves obtaining wax from a mixture consisting of 20-40 wt. petrolatum and 60-80 wt. deoiling the desired permeate from a mixture of petrolatum with a gas fraction 380-500 ^C in a weight ratio of (10-30): (70-90).

 The initial raw material mixture was diluted with a selective solvent (a mixture of methyl ethyl ketone and acetone with toluene), crystallized by cooling, the wax precipitate was separated by step filtration and the solvent was distilled off from the precipitate.

 A distinctive feature of the proposed method is the composition of the feedstock.

 Only an introduction to the process in the claimed ratios of a mixture of raw materials allows to obtain the target product with improved ductility and at the same time increase (compared with the prototype) its yield. Other ratios of the components of the raw mixture lead to a deterioration in the ductility of the resulting wax.

As raw materials and reagents used:
petrolatum (A) TU 38 401166-90
target filtrate (B)
IEC TU 38.10243-80
toluene GOST 14710-80
Component (B) is obtained at the Novo-Ufa Refinery, which has the following characteristics:
Kinematic viscosity at ¹⁰⁰ ° C, mm ² / s 7.5-8.0 Melting point, 35-40 ^C. Oil Content, wt. 25-40
The method according to the claimed invention was carried out on a batch laboratory apparatus, allowing the raw material mixture to be melted, mixed with a selective solvent, crystallization, filtering the precipitate and distilling off the solvent.

The raw mixture of components A and B in the ratio of (20-40) :( 80-60) wt. heated to 70-75 ^{° C} (exceeding 10-15 ^C. petrolatum melting point of the most high melting raw component). Then the raw mixture was diluted with the solvent methyl ethyl ketone: toluene (40-70) :( 60-30) to feed ratio: solvent is 1: (3-9), the thin stock was crystallized at cooling to ^0-5 ° C, the separated precipitate was collected on a filter stepwise funnel and then the solvent was distilled off from the precipitate,
Technological modes of operations for specific examples of the implementation of the proposed method are given in table. 1. The quality indicators of the resulting wax are given in table. 2.

 From the data table. 1 it follows that, in comparison with the prototype, the yield of wax according to the claimed method is 5-15 wt.

 The data table. 2 indicate that the resulting wax has a higher ductility.

 Waxes obtained according to the claimed invention after sulfuric acid contact cleaning were used to prepare alloys for coating cheeses, samples of which, as can be seen from the data given in table. 3, fully satisfy the requirements of TU 38 40142-37 for the alloy for coating cheese SDS-13M.

Claims (1)

METHOD FOR PRODUCING FOOD WAX FROM OIL REFINING PRODUCTS, containing a filtrate from de-oiling a mixture of petrolatum with a fraction of hach 380 380 ^o C in a mass ratio (10 30) (70 90), including dilution of the feedstock with a selective solvent, crystallization, separation of the precipitate of the target product by filtration and distillation of the solvent from the precipitate, characterized in that the initial filtrate is used in a mixture with petrolatum, and the filtrate is taken in an amount of 60 to 80 wt. and petrolatum 20 40 wt.

Images