CS245333B1 - A method of producing high-aromatic oil for rubber purposes - Google Patents

Abstract

The invention relating to a method for producing oils with a high content of aromatics for rubber purposes, or its components, solves the problem of re-extraction of the extract from oils from sulfur-paraffinic petroleum at temperatures of 40 to 70 °C, a temperature gradient in countercurrent extraction up to 25 °C, with the extraction agent furfural, which is used in a mass ratio of extract:furfural of 1:1 to 4. It is possible to work with anhydrous furfural or furfural containing up to 4.5% by mass of water.

Description

3 4 243333

The invention relates to a process for the production of high aromatic oils for rubber purposes.

The rubber industry uses petroleum oils as so-called extenders, which replace some of the monomers without significantly enhancing the properties of the rubber mixtures or as process oils. The company's literature lists a wide range of oils. intended for the rubber industry, namely 3 types: high-aromatic oils, cyclanic oils and alkanic oils. High-aromatic oils have particularly high proportions, improve workability, accelerate the process, increase tensile strength diene elastomers, especially butadiene-styrene, increase impact resistance, creep resistance and also accelerate vulcanization. They are said to have an aromatic content determined by chromatography over 60% and a content of aromatic carbon (% -CA) above 30%. In CSSR, this high-aromatic oil is produced under the name Furex433.

Its basic characteristics are as follows: density at 20 ° C 1 000 - 1 020 kg / m3 kinematic viscosity at 100 ° C 12 - 20 millimeter o v2. s_1 acid number, max 2.5 mgKOH / g

Flash point above 200 ° C Sulfur content, max.

freezing point, max. 10 ° C

Oils (extracts) of such properties are obtained from sulfur-paraffinic by refining with furfural. For production

A procedure was developed by Furex 433 to cool the extract solution leaving the extractor to a temperature of about 50 ° C, whereby the cooled extract solution was separated by 2 layers: pseudorafinate and reextraction, from which the solvent was distilled off for rubber purposes. In the present case, it is essentially a subsequent one-step fraction at a temperature below that of the main extraction apparatus.

A disadvantage of such a process for the production of olives with a high aromatic content is the impossibility of altering, in addition to the temperature, other factors influencing the extraction, in particular the ratio of furfural and the water content of the solvent.

These drawbacks are eliminated by the production of a high aromatic oil by the oil industry, or by its component extraction by furfural, the result of which extracts of sulfur-petroleum oils are subsequently extracted with furfural at temperatures of 40-70. ° C with extract ratio furfural 1: 1 to 4 with water content in furfurale up to 4.5% by weight, countercurrent with temperature gradient up to 25 ° C.

Accordingly, the present method is based on the extraction of furfural oil extracts from sulfur-paraffinic oils in conditions allowing the treatment of high-quality products. EXAMPLE 1 Extract from medium viscosity oil from sulfur-paraffin oil was subjected to one-step extraction of furfural in the laboratory. Extraction conditions, starting extract properties, and recovered extracts are listed in Table 1. Bulk 1 Extract

Extraction temperature, ° C. extract ratio: furfural - water content in furfurale,% wt. Viscosity at 100 ° C, mm 2 s -1 10.46 viscosity index —51 density at 20 ° C, kg / m 3 998 freezing point, ° C 20 yield,% wt. 100 Example 2

In an operating countercurrent extraction of sulfur-paraffinic petroleum extract with furfura-l, with a water content of 0.2% by weight, at a weight ratio of extract: furfural 1: 2,

Reextrakt 12 3 50 1: 4 50 1: 2 70 1: 4 0 0 4.0 14.55 17.02 16.47 —171 —202 —207 1010 1025 1021 2 4 0 69.0 55.3 58, 5 liters at the bottom of the RDiC53 ° C extractor, a 17 ° C temperature gradient, yielded an extract of 56% by weight, satisfying the properties of the oil for rubber purposes. The baseline characteristics of the starting extract and reextract are shown in Table 2.

Claims (3)

24S333 Table 2 Starting extract Reextract Viscosity at 100 qC, mm2s-1 10,65 13,89 Viscosity index —47 —198 Density at 20 ° C, kg / m3 982 1018 Pour point, ° C 21 5 Acid number, mgKOH / g 0, 23 0,67 Flash point, ° C 215 211 Sulfur content,% wt. 3.12 3.94 Nitrogen content,% wt. 0.25 0.32% CA 30.3 39.1 Group composition, wt. saturated hydrocarbons 25,8 9,2 aromatics 66,1 82,4 resins 7,8 8,2 losses 0,3 0,2 OBJECT Method of producing high-content oil for rubber purposes or its components by furfural extraction characterized in that extracts from oils from paraffinic oils are subsequently extracted by furfural at temperatures of 40 to 70 ° C with an extract: furfural 1: 4 weight ratio containing water in furfural to 4.5% by weight, countercurrent with a temperature gradient of up to 25 degrees Celsius.