CS256576B1 - A method for preparing a dispersion containing 25 to 50 wt. paraffinic hydrocarbons - Google Patents

Abstract

Prepares sg aqueous dispersion of paraffinic hydrocarbons using dispersants and a hydrodynamic generator. The resulting dispersions are stable for several months. Dispersions are intended for hydrophobization of wood, paper, textiles and other materials.

Description

The invention relates to a process for the preparation of a dispersion having a content of 25 to 50% by weight. of paraffinic hydrocarbons with a pour point of 30 to 65 ° C by means of a dispersant and a hydrodynamic generator.

Paraffin hydrocarbons having a pour point of 30 to 65 ° C are understood to be hard paraffin waxes, ceresin and so-called paraffin waxes. Slack waxes, which are substantially hard paraffinic hydrocarbons having a higher mineral oil content of up to 30% by weight, and which are formed by dewaxing of selective oil raffinates. These paraffinic waxes and slacks comprise a mixture of paraffinic hydrocarbons having a carbon number of Cie to C10. Dispersions of these paraffinic hydrocarbons have found widespread application in the hydrophobization of wood, paper, textiles, rubber and the like.

Dispersions of paraffinic hydrocarbons are often referred to as paraffinic emulsions.

Dispersions are prepared by known methods by mixing the dispersant and the paraffinic hydrocarbon while adding water to the desired concentration of the dispersion. MS. AO 161319 discloses a process for preparing an aqueous hydrophobic paraffin dispersion using dispersants based on oxyethylated alkylphenols and stabilizing the resulting dispersion with natural starch in an amount of 0.5 to 4.8 wt. ·%, Wherein the mixing of said components is done by a turbine stirrer. Dispersants are known which are used to prepare the dispersion, e.g. oxyethylated higher fatty alcohols (U.S. Pat. 3,563,910), oxyethylated fatty alcohols along with the reaction product of octadecylamine, acetic acid and epichlorohydrin (NSC Pat. 1,104,648), higher fatty acid salts of alkanolamines (U.S. Pat. 1,981,608). The dispersions are prepared in conventional mixing tanks with a powerful stirrer.

Dispersions can also be prepared by means of an ultrasonic device or so-called. colloid mills, respectively. As a separate element in the preparation of dispersions, a device operating on the principle of a mechanical vibrator called a hydrodynamic generator is used.

A disadvantage of the preparation of paraffin dispersions when using a conventional type of stirrer is that the resulting dispersions have paraffinic hydrocarbon particles uneven, which has the effect of reducing the stability of the dispersion. using additional stabilizers for several days. Also in this process of preparing dispersions, it is necessary for a long time, up to three hours, respectively, to mix the individual components of the dispersant. even more, until the dispersion is cooled to a temperature of about 35 ° C. A major disadvantage of this method of preparation is that the process is discontinuous. In addition to the raw material containers and the finished product, the dispersion preparation equipment must have a large-volume mixing tank provided with a stirrer, in which the desserts are prepared, as the main production element.

In the process of producing dispersions without an auxiliary dispersant, using only ultrasonic or hydrodynamic generator devices, the dispersions obtained have a very short stability time.

Process for preparing an aqueous dispersion containing 25 to 50 wt. % of paraffinic hydrocarbons having a freezing point of 30 to 65 ° C by dispersing in water at a temperature above the freezing point in the presence of a dispersing agent, characterized in that the dispersant in a total amount of 10 to 20 wt. the calculated ha weight of the paraffinic hydrocarbons is first dissolved in the paraffinic hydrocarbon and / or water and after heating to 50 to 50 ° C the aqueous and paraffinic phases are simultaneously injected into the hydrodynamic generator under pressures of 0.5 to 2 MPa.

An advantage of this process for preparing a paraffinic hydrocarbon dispersion having a solidification temperature of 30-65 ° C is that the mechanical oscillations of the hydrodynamic hydrothermal generator, thanks to the coefficients of the sound pole, co-assist the dispersing agent to disperse the particles in a dispersible form. few months. Our process for preparing paraffinic dispersion can also be done so that some types of dispersants, which consist of several components and some of which are water soluble and caffeinated in a paraffinic hydrocarbon, can be prepared "in situ" from the starting materials directly in the hydrodynamic generator, meaning that the dispersant need not be prepared separately. Furthermore, the advantage of preparing a paraffinic dispersion in this way is that the preparation time is substantially reduced to a few minutes compared to the conventional mixing method, which has a significant effect on energy savings. The hydrodynamic generator can be placed directly in the paraffinic dispersion container, a large-volume mixing tank with stirrer need not be installed, thereby saving installation costs during the construction of the paraffinic dispersion production plant. The process for the preparation of the paraffinic dispersion according to the invention can also be operated continuously, which is not possible in the conventional process. The preparation of paraffinic dispersions according to our process also has the advantage that stably dispersions can be prepared over a wider range of carbon atom distribution in the paraffinic hydrocarbon than in the conventional dispersion preparation method using a conventional stirrer that is sensitive to the type of dispersant.

Further advantages are apparent from the application examples.

Example 1

Up to 100 wt. parts by weight of molten paraffinic slacks having an oil content of 20% by weight; and a solidification temperature of 30 to 65 ° C is added and homogenized at 50 to 75 ° C to 20 wt. % of a dispersant prepared from 50 wt. % of a C10-C18-carbonated fatty alcohol having 6 moles of ethylene oxide and 50 wt. octadecylamine oxyethylated with 2 moles of ethylene oxide. Then, by means of a pump having an adapted suction line, 1 wt. parts of paraffin wax having a dissolved and homogenized dispersant at a temperature of 65-75 ° C. From the water tank heated to 65-75 ° C, 2 wt. parts of the water to the pump and the mixture proceeds to the head of the hydrodynamic generator, where a dispersion is formed by passing through the sounding zone. The optimum pressure for proper hydrodynamic generator washing is 0.5 to 2 MPa. The paraffin dispersion thus prepared is stable up to 6 months.

By way of comparison, the dispersion prepared according to Example 1, but using a turbine mixer, is stable for 2 months.

Example 2

Up to 90 wt. parts by weight of paraffinic hydrocarbon with a pour point of 52-54 ° C are added and dissolved at 7.5-80 ° C with stirring, and 7.5 wt. parts of stearic acid. 1.5 wt.% Are added and homogenized to 100 parts water at 65-80 ° C. parts of triethanolamine. Using a pump with a modified suction line, 1 wt. parts by weight of paraffinic hydrocarbon with dissolved stearic acid and 3 wt. parts of water, warm 65 to 89 ° C with dissolved triethanolamine, into the head of the hydrodynamic generator, where by passing through the sound zone, a dispersant is formed "in situ" and at the same time a paraffinic dispersion is formed. The dispersion thus prepared is stable for 4 months.

Example 3

According to the procedure of Example 2, a dispersion of ceresin is prepared, but the ratio of paraffinic hydrocarbon to science is 1 to 3. The resulting dispersion is stable for 3 months.

Example 4

By way of comparison, the preparation of a paraffinic hydrocarbon dispersion in the presence of a dispersing agent is only aided by 11 hydrodyne balls of the generator.

One wt. molten paraffinic slacks with an oil content of 20% by weight and a pour point of 30 to 65 ^° C is pumped with 2 wt. parts of demineralized water into the head of the hydrodynamic generator, where by passing through the marked zone a paraffinic dispersion is formed. The dispersion thus prepared only lasted for a few seconds.

Claims (2)

20% by weight oil and 20 to 65 ° C solids are added and homogenized at 50 to 75 ° C. parts of a dispersant prepared from 50 wt. of a fatty alcohol having a carbon number of C 10 to C 18 oxyethylated with 6 moles of ethylene oxide and 50 wt. of octadec-cylamine oxyethylated with 2 moles of ethylene oxide. Thereafter, 1 part by weight of paraffin waxes with dissolved and homogenized dispersant is pumped through the pump, which is provided with a suction line, at a temperature of 65 to 75 ° C. At the same time, 2 wt. the water goes to the pump and the mixture continues to the head hydrodynamic generator, whereby a leakage occurs through the sounding zone. The optimum pressure for the hydrodynamic generator laundry is 0.5-2 MPa. The paraffin dispersion thus prepared is stable for up to 6 months. By way of comparison, the dispersion prepared according to Example 1, but using a turbine mixer, is stable for 2 months. parts of a paraffinic hydrocarbon with a freezing point of 52-54 ° C are added with a temperature of 65-80 ° C and 7.5 wt. parts of stearic acid. To 100 parts of water, 1.5 wt.% Is added and homogenized at 65 to 80 ° C. parts of triethanolamine. With a pump with a modified suction line, 1 wt. the paraffinic hydrocarbon was dissolved by dissolved stearic acid and 3 parts by weight of water, 65-89 ° C dissolved with triethanolamine, into the head of the hydrodynamic generator, whereby the irt shit dispersant was formed by passing through the sound zone and the paraffin dispersion was formed. The dispersion thus prepared was 4 months. EXAMPLE 3 A ceresine dispersion was prepared according to the procedure of Example 2, but the ratio of paraffinic hydrocarbon to water was 1 in 3. The dispersion was stable for 3 months. EXAMPLE 4 For the sake of comparison, the preparation of a dispersion of paraffinic hydrocarbons using the presence of a dispersing agent is only by means of a hydrodynamic generator. One mass. of molten paraffinic wafers having an oil content of 20 wt. with a solidification temperature of 30 to 65 ° C, at a temperature of 70 to 80 ° C with a pump, with a suction line treated with 2 wt. by means of deionized water to the hydrodynamic generator head, whereby a paraffinic dispersion is formed by passing through the labeled zone. The dispersion thus prepared was only a few seconds. P R E D Η E T A process for the preparation of an aqueous dispersion comprising from 25 to 50 wt. of paraffinic hydrocarbons having a solidification point of 30 DEG-6 DEG C. by dispersing in water at a temperature above freezing point in the presence of a dispersing agent, characterized in that the dispersion is 10 to 20% by weight based on weight The paraffinic hydrocarbons are dissolved in the paraffinic hydrocarbon and / or in water, and the water and paraffinic phases are fed simultaneously under a pressure of 0.5 to 2 MPa into a hydrodynamic generator after heating at 50 to 80 ° C. 2. A method according to claim 1, wherein a dispersing agent prepared from 40 to 60 pounds is preferably used as the dispersing agent. wt. of a fatty alcohol having a carbon number of C 10 to C 10 oxyethylated carbonates having from 5 to 10 moles of ethylene oxide and from 40 to 60% by weight of C 10 to C 20 alkoxylated carbonyl with 1 to 6 moles of ethylene oxide.