RU2381068C1 - Composition for preparing cation-exchange resin - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: strongly acidic cationites can be used for purifying waste water, separating and purifying different substances in the chemical industry. The composition for preparing cation-exchange resin contains formalin, sulphuric acid, phenol and phenol resin - wastes from phenol production with the following content of components of the composition (wt %): formalin 55.7; sulphuric acid 25.2; phenol resin 4.8-14.3; phenol 4.8-14.3.

EFFECT: obtaining cation-exchange resin with low cost without deterioration of its properties and recycling phenol resin.

1 tbl, 5 ex

Description

The invention relates to the production of ion-exchange polymer resins, namely, strongly acidic cation exchangers for wastewater treatment, softening and desalination of water in water treatment, separation and purification of various substances in the chemical industry.

Known cation exchange resin Katex FN, containing phenol, formaldehyde and naphthalene. The main disadvantage of Katex FN cation exchanger is the low static exchange capacity (СОЕ = 0.54 mEq / g) [1].

Known cation exchange resin KU-1, containing phenol, formalin and sulfuric acid in the following composition content, wt.%:

Formalin 55.7 Sulphuric acid 25,2 Phenol 19.1

[2]

KU-1 is resistant in acidic, neutral and slightly alkaline environments, characterized by annual mechanical losses of cation exchange resin during operation no more than 3-4%. KU-1 is used for the purification of sugar juices in the sugar and hydrolysis industries, for the extraction of alkaloids, etc. However, the synthesis of this cation exchange resin requires the use of high-quality monomers, which increases its cost.

When creating the invention, the task was to obtain a cation exchange resin with lower cost and with properties not inferior to existing industrial analogues.

This is achieved by the fact that in the composition for producing a cation exchange resin containing formalin, sulfuric acid and phenol, phenolic resin is additionally introduced - a waste product of phenol in the following composition components, wt.%:

Formalin 55.7 Sulphuric acid 25,2 Phenolic resin 4.8-14.3 Phenol 4.8-14.3

The essence of the invention lies in the fact that part of the phenol used in the synthesis of the cation exchange resin is replaced by a phenolic resin (TU-2424-020-05757601-98), which contains, in wt.%:

Phenol 6-22 Cumylphenol 19-41 Acetophenone 5-35 Α-methylstyrene dimer 19-42 α-methyl styrene 0.61 Acetone 0.05 Mesityl oxide 0.04 Isopropylbenzene 0.01

Phenolic resin is a fraction of high-boiling components, which is a waste product of the phenol-acetone cumene method, the amount of which is from 120-140 to 150-200 kg / t of phenol. In world practice (USA, Russia, Poland, Slovenia and other countries), phenolic resin is used as a boiler fuel individually or in a mixture with other products (pyrolysis resin, fuel oil). Incomplete combustion of the resin leads to air pollution, therefore, the development of economically sound and environmentally acceptable methods of its disposal is an urgent task for both Russian and world industrial practice [3]. The composition is prepared as follows:

Example 1 (prototype)

19.1% phenol and 25.2% sulfuric acid are mixed at 105 ° C for 2-3 hours. The resulting sulfomass is mixed with 55.7% formalin at 50 ° C for 15 minutes, the reaction mixture is dried at 60 ° C for 45 minutes, solidified at 105 ° C for 24 hours.

Example 2

4.8% phenolic resin, 14.3% phenol and 25.2% sulfuric acid are mixed at 105 ° C for 2-3 hours. The resulting sulfomass is mixed with 55.7% formalin and then processed according to the mode specified in example 1.

Example 3

9.55% phenolic resin, 9.55% phenol and 25.2% sulfuric acid are mixed at 105 ° C for 2-3 hours. The resulting sulfomass is mixed with 55.7% formalin and then processed according to the mode specified in example 1.

Example 4

14.3% of phenolic resin, 4.8% of phenol and 25.2% of sulfuric acid are mixed at 105 ° C for 2-3 hours. The resulting sulfomass is mixed with 55.7% formalin and then processed according to the mode specified in example 1.

Example 5

19.1% phenolic resin and 25.2% sulfuric acid are mixed at 105 ° C for 2-3 hours. The resulting sulfomass is mixed with 55.7% formalin and then processed according to the mode specified in example 1.

Table The composition of the example SOE, mEq / g Power
curing% Price for 1 unit. exchange capacity, rubles one 4.2-4.5 - 15.45 2 3,51 97.0 14.2 3 3.06 92.1 12.70 four 3.66 94.6 7.60 5 3.78 82.5 4.45

As can be seen from the table, when the phenolic resin content in the composition is 19.1 wt.% (More than 14.3 wt.%), Cation exchange resin with a low degree of cure is synthesized, which indicates the incompleteness of the formation of the polymer network structure.

The content of phenolic resin in the amount of 4.8-14.3 wt.% Allows you to get a cation exchange resin, similar in properties to industrial analogues, with lower cost, while solving the problem of recycling phenolic resin.

In this regard, the composition containing 14.3% phenolic resin, characterized by an exchange capacity of 3.66 mEq / g, with a cure rate of 94.6%, is recommended as the optimal composition.

Thus, an economically feasible and environmentally acceptable method for the utilization of phenolic resin has been proposed, which provides cation exchange resin, used primarily for the treatment of industrial wastewater from chemical, petrochemical and oil refineries.

Information sources

1. Handbook of a chemist. - Ed. 2nd, per. and add. - Volume 4. / Ed. B.P. Nikolsky. - M .: Chemistry. - 1966.

2. Technology of plastics / ed. V.V. Korshak. - M .: Chemistry, 1972. - 616 p.

3. The problem of rational use of phenolic resin / Sangalov Yu.A. and [other] - Chem. industry. - 1997. - No. 4. - S.3-13.

Claims (1)

A composition for producing a cation exchange resin containing formalin, sulfuric acid and phenol, characterized in that it further comprises a phenolic resin - a waste product of phenol in the following composition components, wt.%:
Formalin 55.7 Sulphuric acid 25,2 Phenol 4.8-14.3 Phenolic resin 4.8-14.3