SU60195A1 - Method of dephenolization of supra-resin waters - Google Patents

Description

The subliminal water produced during the production of phenol formaldehyde resin is a solution of phenol and formaldehyde, which did not react to CO during the condensation process of the resin and methyl alcohol, which was converted to supramolene water from formalin used for the reaction. The concentration of these substances in supra-resin water depends on the conditions of the production process, whereas the concentration of methyl alcohol also depends on its concentration in formalin taken into the reaction.

The composition of the tar water is approximately as follows:

phenol4% on average

formaldehyde ... 3% methyl alcohol. . ten%

The reaction is weakly sour.

Austrian patent no. 106018 describes a method for producing artificial resins by heating supra-resin waters in the presence of seric acid. According to the present invention, such a process is proposed of dephenolol, van: and tar-water, in which all phenol dissolved in supra-resin water is completely bound. Is achieved

This is the introduction of cepHoii acid in two steps.

First, sulfuric acid is added to the supra-resin water in such a quantity that its concentration in the super-resin water is 5%. the solution is heated, the resulting resin is isolated. Then sulfuric acid is added again to its 8% concentration and methanol is distilled off.

The introduction of the acid in two steps makes it possible to obtain a resin having the required technological parameters.

In order to fully bind phenol and the maximum possible amount of formaldehyde in the over-resin water, it is necessary to create a ratio between phenol and formaldehyde of 100: 40. A higher concentration of formaldehyde than at a ratio of 100: 40, although it accelerates the process of dephenolization, but leads to the formation of a resin with a high viscosity at which the extraction and drying of the resin is difficult. A lower concentration of aldehyde impedes the dephenolization process and, at a ratio of 100: 30, does not completely bind phenol.

In order to create a ratio of i with phenol and formaldehyde of 100: 40, it is usually necessary to introduce phenol into the resin. Extraction of phenol is notably striving to obtain the necessary technological resin | Abuslozen indicators are also necessary to extract the maximum amount of formaldehyde possible under these conditions.

In practice, there may be cases when the add-on. phenol will not be required; possible; and in such a case, when it is necessary to add a certain amount of formaldehyde to create i the specified ratio.

The invention may be illustrated by the following example.

The cylindrical apparatus with a conical bottom, equipped with steam heating, a cooler and a propeller agitator, is loaded with a resin water through a measuring device, then a reflux cooler is switched on and the required amount of sulfuric acid is applied by the mixer;

After a short stirring; the reaction liquid enters the jacket of the apparatus steam. The reaction liquid is refluxed for 10-20 minutes. After this time the steam; it is closed, the resin is collected in the conical part of the apparatus and released through specks. After deleting | Sulfuric acid is added again from the resin apparatus, the cooler is switched to direct with and steam is again allowed to heat. From this point on, the distillation of methyl alcohol begins .;

At the end of the distillation process I, the residue of the reaction liquid is injected.

h n (neutralizer) n is neutralized with limestone M10block.

After neutralization, the gypsum is either filtered using a filter press and the filtrate is lowered into the sewer system or allowed to settle in special septic tanks.

The resulting resin must be washed with water and dried.

Cheese resin contains up to

1% of free phenol is dissolved in alcohol, the Kremer-Sarpov softening temperature is about 65 °, the rate of polymerization on the prp 150 tile with the addition of 10% hexamine about 1 15.

PROPOSITION AND REFERENCE.

1. A method for dephenolizing padsmol waters of production of fepoplasts by condensation of residual phenol and formaldehyde, using sulfuric acid as a catalyst, in terms of catalyst; and with the fact that sulfuric acid is introduced into the supramolar water in two steps - c. the beginning of the condensation process and after the removal of the formed resin, in order to more fully bind the phenol during the subsequent operation of methanol distillation.

2. Acceptance of the method: Yu p. I, O tl I h and y with the fact that sulfuric acid is introduced for the second time in an amount corresponding to obtaining its 8% concentration in supersalt water.

3. Acceptance of the method according to paragraphs. 1 Ml 2, characterized in that the ratio of phenol and formaldehyde in the supra-resin sol is adjusted, if necessary, to 100: 40 by adding appropriate quantities of one of the components.