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(31) Sulphuric acid is used to do this. The zinc content dissolves whereas iron precipitates and lead and silver remain undissolved.

(32) The two-phase nitration ofp-cresol by aqueous sulphuric acid, potassium nitrate and diethyl ether has been studied, yield as high as 83% 2-nitro-p-cresol.

(33) A novel technology of separating indium and tin from sulphuric acid leach solution of ITO waste target by sulphuration precipitation has been developed.

(34) A new drying and absorption process is put forward for sulphur - burning sulphuric acid plant.

(35) The indigo dyed fibre fabric was dissolved with concentrated sulphuric acid. The solution was analyzed spectrophometrically.

(36) The technology process and production situation of the chlorine hydride absorption system in potassium sulphate process with traditional sulphuric acid process is introduced.

(37) Development and application of a diluter for low - level heat recovery in sulphuric acid plants are described.

(38) Introduces the structure, characteristics of LGQ type gauger, and the situation of measuring water and sulphuric acid in SSP production.

(39) Several upgrading and modernization of the sulphuric acid plants were completed in minimum shutdown time and according to practical condition of plants, resulting in significant economical benefits.

(40) The hydrolysis of dried - powdered fibrous sago waste by sulphuric acid and glucoamylase was studied.

(41) His prototype used dilute sulphuric acid and operated at room temperature.

(42) In this work, the 4-methoxyphenol was prepared from hydroquinone, methanol which were catalyzed by benzoquinone and concentrated sulphuric acid. The yield of 4-methoxyphenol was 80%.

(43) In the first step KHSO4 is formed from KCl by acidulation using sulphuric acid.

(44) In the process of catalysis and synthesis of polyester polyhydric alcohol by MSA, the catalyst performance of MSA was hatter than sulphuric acid.

(45) The improvement and operation of natural circulation waste heat boiler for sulphuric acid plants are described.

(46) Protein in foods is determined after digestion with sulphuric acid.

(47) After removing polyphenols, pigments and other substances by precipitation with lead subacetate, the residual lead ions are removed by adding sulphuric acid.

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(48) The additive is the reaction product of sulphuric acid, water and leady oxide.

(49) The GB stipulates that high manganese steel should be dissolved by rare sulphuric acid, the silicon in the solution should be determined by the molybdenum blue photometric method.

(50) This Paper studies the reaction conditions of the Barium Sulphate and EDTA in ammonia water solution and proposes to use EDTA titration to determine sulphuric acid in Trinitro-resorcinol.

(51) The plastic housing, mostly polypropylene, contains lead electrodes and sulphuric acid.

(52) Her hand came into contact with sulphuric acid and was burned.

(53) Hydrogen is a product of the reaction between zinc and sulphuric acid.

(54) The order of the pretreatmemt effectiveness is lignin - activating agent, chelating agent, xylanase and sulphuric acid.

(55) The pieces were then thrown into a barrel of sulphuric acid.

(56) The process condition of preparing amyl alcohol with C5 fraction as material, through sulphuric acid addition hydrolyzation was studied.

(57) Concentrated sulphuric acid was developed to etch the banded texture of thermotropic main chain liquid crystalline copolyester B-N, showing excellent selectivity for this nematic texture.

(58) Sulphuric acid acid recovery of 60 %, effective use of energy and reduce the cost of acid.

(59) Structure, installation and operation of a LD30 electrostatic precipitator in a sulphuric acid plant based on gold smelter off-gas are described.

(60) XDS stainless steel sheet for high-temperature concentrated sulphuric acid was developed by comprehensive improvement research on the basis of theory of alloy design.