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本文用亚硝酸比色法测定天然气中硫醇。采用抑制硫醇镉水解的氯化镉-氢氧化钠吸收液。测定了天然气硫醇、甲硫醇、异丁硫醇、戊硫醇和己硫醇的S-亚硝基衍生物在氨基磺酸溶液中的分解速度。采用降低氨基磺酸铵浓度和控制分解时间,获得与相对标准曲线一致的标准曲线。试验了氯化镉吸收液的pH值,沉淀量和镉离子浓度对吸收率的影响。发现铁氰化钾溶液能吸收硫醇,不适宜作硫化氢过滤液。本方法适用于脱硫后天然气中硫醇的生产控制分析,可测定含硫醇0.1ppm以下的气样,相对误差小于30%,分析时间1小时。
In this paper, nitrite colorimetric determination of mercaptans in natural gas. A cadmium chloride-sodium hydroxide absorbing solution that inhibits the hydrolysis of cadmium mercaptide is used. The rate of decomposition of S-nitroso derivatives of natural gas mercaptans, methyl mercaptan, isobutyl mercaptan, pentanethiol and hexanethiol in sulfamic acid solution was determined. Ammonium sulfamate concentration is reduced and the decomposition time is controlled to obtain a standard curve consistent with the relative standard curve. The effects of pH, amount of precipitated Cd2 + and Cd2 + on absorption rate were tested. Found that potassium ferricyanide solution can absorb thiols, not suitable for hydrogen sulfide filtrate. The method is applicable to the production control analysis of mercaptan in natural gas after desulfurization. The gas sample containing mercaptan below 0.1ppm can be measured, the relative error is less than 30% and the analysis time is 1 hour.