SU598857A1 - Method of separating mixtures containing penol, quinoline, naphthalene or their homologs - Google Patents

Description

phase, which requires compliance with the following conditions for the membrane: the pressure is not higher than 30 mm Hg. temperature is not lower.

The method was developed on model mixtures, x: those remaining from phenol, kinolin, and naphthalene.

The process is carried out as follows: the initial model mixture at a temperature of 95-1BO C is in contact with one side of the polymer membrane. The non-diffused mixture is recycled or divided into the next step. The mixture diffused through the membrane is removed from the other side under reduced pressure {1-30 mm Hg). This mixture is enriched with phenol and is depleted in quinoline. As a result of multi-stage processing of the diffused and

Negz) Odinfucked mixtures get phenol, quinoline and naphthalene, which are similar in characteristics and technical products,

Example. A mixture consisting of 25.9% phenol, 17.5% quinoline and 56.6% naphthalene is placed in a diffusion cell with an F-26 fluoroplast membrane with a thickness of 100. Both cells are temperature-controlled separately: the temperature in front of the membrane is 95 ° C , behind the membrane - 120С. The pressure behind the membrane is 2-3 mm Hg. The diffused mixture is re-contacted with the gotenk under these conditions. When staged contacting the mixture with a fluoroplastic membrane, the following results were obtained:

Table 1

25.9 43.7 70.3 85, i 93.7

So, already due to a single contact of cfiecHf consisting of phenoia, cement and naphthalene, with a polymer membrane, the mixture is enriched with phenol and depleted, with chicoline of at least 1.5 pTa.

The mixture obtained after step 1 on the content of phenol and naphthalene anaFracts1-

Phenol

Phenol

30--40

Naftalinova

1-3 Absorption 1-3

Wide distillate {includes fractions 1, 2, 3)

5-7

56,6

45.0

Зг5

28.0 10.6

14.1 10.2

6.2

logical phenolic fraction of coal tar. As a result of its contact with the membrane, technical phenol can be obtained. ;

For example, the fractions obtained by distilling coal tar can be separated by the present method, and the composition is usually as follows:

T a B1 L and c a 2

Content%

Neutral Hydrocarbons

10-20

40-50

1-3

92-98

4-6 90-95

5a

85-90

Example2. As the initial mixture, a mixture of a broad distillate selected for the distillation of coal tar was taken (Table 2).

A mixture consisting of 6.4% phenol, 4.8% quinoline and 88.6% naphthalene is placed in a diffusion cell with a f-42 fluoroplast membrane with a thickness of 80. The temperature in front of the membrane and behind it is. The pressure behind the membrane is 4 mmHg. The diffused mixture is re-contacted with the membrane under the same conditions. As a result of five-step contact with the membrane, product A is obtained, containing 93.4% phenol, 0.2% quinoline and 6.4% naphthalene,

 The non-diffused mixture from all contact stages is mixed (mixture B, its composition phenol 0.8%

Further purification of phenol, quinoli on. and naphthalene can be produced either at the next stage of contact, L6: 9 using well-known methods. .

Example 3. The composition of the initial mixture,%:

quinoline 5.0%, naphthalene 94.2i) and served in the same cell. From this mixture, and practically free of phenol, and the result of seven-step contact, product C is isolated, containing 91.9% quinoline and 8.1% naphthalene.

The non-diffused residue from these contact steps (product D) contains 0.8% phenol, 0.6% quinoline and 98.6% naphthalene (mp. 79,.

The figure shows a diagram showing the change in the composition of the mixture entering each separation step (the first line is the percentage of phenol, the second is quinoline, the third is naphthalene).

As a result of this scheme, the following products were obtained:

Tbl l and c and 3

The separation temperature is 145 ° C, the membrane thickness is 26 mm Hg. Art. The composition of the penetrated mixture,%:

PRI me R 4. The composition of the initial mixture,%:

II p and me R 5. The composition of the original estimate:

ortho-cresol4,9

Hinaldink

15

OL-methyl-naphthalene59, 3

89.0

d-methyl-naphthalene

Claims (1)

The separation temperature is 130 ° C, the pressure behind the membrane is 12 mm Hg. Art. The composition of the penetrated mixture,%: The formula of the invention. The method of separation of mixtures containing phenol, quinoline, naphthalene or their homologs, about tl and h and 51 and so that, in order to simplify the process technology, the initial mixture is passed through a non-porous membrane fusible fluorol-5 at a temperature of 95-150 C and a pressure behind the membrane of 1-30 mm Hg. Art. Sources of information taken into account in the examination: 1. The author's certificate of the USSR 191508, cl. From 07 C 15/24, 1967. 2, USSR Copyright Certificate 403659, cl. From 07 to 15/24, 1973.