SU925954A1 - 4-h-butyl-4h-octadecyl-1,4-tetrahydrothiazenium-1-oxide bromide as collecting reagent for flotation purification of effluents - Google Patents

Description

However, the degree of industrial wastewater treatment is not high enough. The aim of the invention is to increase the efficiency of purification of industrial wastewater. This goal is achieved by a new compound of the formula bromide 4-n-butyl-n-octadecyl-1, -tetrahydrothiazine oxide (BNSO) as a reagent-collector for flotation wastewater treatment. Method: The preparation of these compounds is based on the known reaction of the preparation of quaternary ammonium salts by the quaternization of tertiary amines 3 and consists in that α-n-octadecyl-1, 4-tetrahydrothiazin-1-oxide reacts with n-butyl bromide when heated in nitromethane. Example. Preparation of bromide, n-butyl-n-octadecyl-1, rotiazinium-1-oxide tetrahydide. To a solution of 55.6 g of (0,) -n-oxtadecyl-1, -tetrahydrothiazin-1-oxide in 100 ml of nitromethane was added a solution of 23.5 g (0.17 M) of n-butyl bromide in 40 ml of nitromethane and Heat the mixture for 2 h at. . The reaction mixture is poured into acetone, the precipitate is filtered off, washed with ether and dried under vacuum. 73.3 g (96%) of bromide “-n-butyl -“ - n-octadecyl-1, A-tetrahydrothiazinium-1-oxide are obtained. Elemental analysis. Found: Br 15.91; S 6.5 Syb Nvc BrNOS Calculated,%: Vg 15.71; S 6.30. The IR spectrum contains absorption bands in the 1030-1050 CM area (). BNSO studies as a collector reagent for flotation wastewater treatment are carried out on wastewater. Baikal Pulp and Paper Mill (BPPM). According to the norms approved for the Baikal pulp and paper mill for chemical wastewater, purified water should have the following: Chemical oxygen absorption (COD) 90 mg / l, chromaticity 90 degrees, suspended 15 mg / l. The initial runoff sample has the following characteristics: COD - 240 mg / l, chromaticity 2bO hail, weighted 210mg / l; pH - 7.1. The flotation properties of BNSO are examined in comparison with the industrial reagent ANP-2. Example 1. The sample is treated with aluminum sulphate coagulum nt) and polyacrylamide (PAL) (Olokul nt) according to the BPPM mode (consumption of aluminum sulphate by IPAA 0.38 mg / l). The resulting sediment is highly watered, hydrophilic and cannot be coalesced without the use of a reagent-collector. With 0.1 n. establish pH 5,8. ANP-2 or BNSO collector reagents are added to the treated sample. Then the sample is placed in a flotation column with an AOO ml volume, the bottom of which is a Schott filter tf 4. For 8 min (for ANP-2) and 4 min (for BNSO), dispersed by the porous bottom of the air funnel is passed (air flow rate 0.9 l / min) Water quality indicators (COD, chromaticity, weighted) are determined by the methods of Yu.Yu. Lurie. The results are shown in table 1. Table 1

180

12 13 15

95 90 50 113 Oe

82 k6 9.1

Reagent-collector ANP-2, flotation time 8 min

. Pr09chlzhenie table. one

Table3

Claims (1)

Claim 4-n-butyl-4-n-octadecyl-1,4-tetrahydrothiazinium-1-oxide bromide of the formula I-C4H94. + / —CH Λί S —O ^p —7 as a collector reagent during flotation wastewater treatment.