硫代硫酸钠合成条件的优化

优化了亚硫酸钠与硫磺反应制备硫代硫酸钠的合成条件，最佳反应条件为：亚硫酸钠与硫磺质量比为7：2，亚硫酸钠与水质量比为1：1，溶液pH=10，反应时间30min，此时亚硫酸钠转化率为95．9％，产品纯度98．9％，收率94．5％。     

蒸发段长度与充液量对高温钠热管启动过程的影响

通过对 7根结构参数不同、充液量不同的高温钠热管进行实验研究 ,给出各种情况下高温钠热管启动过程中温度随时间变化曲线 ,分析了蒸发段长度的变化及充液量的变化对高温钠热管启动过程的影响。实验结果表明直径为 2mm ,长 1 0 0 0mm的钠热管 ,蒸发段长度为 5 80mm且充有 78～ 90 g左右的充液量 ,其启动运行工作为最佳     

2-氨基-4-甲氧基-6-甲硫基嘧啶的合成研究

以2-氨基-4-氯-6-甲氧基嘧啶、甲硫醇钠原料合成2-氨基-4-甲氧基-6-甲硫基嘧 啶。对影响反应的主要因素进行了研究,优化条件下,收率高于97％,产品纯度高于95％。     

重碱加压过滤的研究探索

在化工领域偿试使用加压过滤技术处理重碱，使重碱水份由真空过滤的１８～２０％降为加压过滤的１２％，可使生产厂家降低能耗；节约返碱     

六偏磷酸钠的生产工艺

本文对六偏磷酸钠的性质、用途及生产工艺进行论述并介绍从日本引进１．５ｋｔ／ａ食品级六偏磷酸钠生产装置投产运行情况。     

3-氯-2-羟基丙磺酸钠的合成研究

以环氧氯丙烷和亚硫酸氢钠为原料合成了3-氯-2-羟基丙磺酸钠,探讨了磺化剂种类及用量,溶剂水的用量,反应温度,反应时间对产率的影响,并用红外光谱及元素分析对产物的结构进行表征。实验表明,磺化剂宜用亚硫酸氢钠;亚硫酸氢钠/环氧氯丙烷比越大,水的用量,反应温度,反应时间适中时,产率越高,最高产率为40.7%;产物的熔点为2531℃。     

王集磷矿石不加温浮选试验

王集磷矿石采用GD系列捕收剂，在不加温的情况下可以获得与加温到55～60℃时相近的浮选指标。其经济效益和节能十分可观。     

Solubility of Na2SO4, Na2CO3 and their mixture in supercritical water

The solubility of many salts in water decreases dramatically with temperature in the vicinity of the critical point of pure water. Examples of these salts are sulfates of sodium, potassium, lithium and sodium carbonate. These salts are usually produced during supercritical water oxidation (SCWO) and contribute to fouling. The solubility of Na₂CO₃ and Na₂SO₄ has been determined in pure form and in the presence of each other, for the temperature range relevant to SCWO. The experimental procedure was to pass the salt solution through a tube at constant temperature. After a brief initiation period during which no salt sticks to the tube, the salt above the solubility limit deposited on the tube surface. The solution leaving the section was thus at the solubility limit. A rapid decrease in the salt solubility was observed just above the pseudo-critical temperature. For supercritical conditions, the solubility of each salt in the form of a mixture was quite close to the solubility of pure salt. At the highest fluid density considered (480 kg/m³) the presence of Na₂CO₃ reduces the solubility of Na₂SO₄, as might be expected from the “common-ion effect”.     

Oxidative coupling of methane over Na+-ZrO2-C1-/Al2O3 catalysts

Oxidative coupling of methane (OCM) was carried out over Na⁺-ZrO₂-Cl /A1[₂O₃ catalysts in a temperature range from 1023 to 1123 K. The catalysts were prepared by impregnating the α- or γ-Al₂O₃ supports with sodium carbonate and/or zirconyl chloride. The OCM activity was examined using the catalysts prepared by three different preparation procedures. The best catalyst was the one prepared by subsequent impregnation of sodium carbonate-preimpregnated γ-Al₂O₃ with a mixed solution of sodium carbonate and zirconyl chloride. It was found that preimpregnated sodium played an important role in reducing the combustion activity of the γ-Al₂O₃. The catalyst with an optimal composition showed the highest C₂ selectivity and yield of 40.8% and 15.1%, respectively. From the X-ray diffraction analysis it was found that tetragonal ZrO₂ was formed and that NaCl existed in the catalysts with relatively high sodium contents.     

Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part III. The importance of the interactions between volatiles and char at high temperature

A novel two-stage fluidised-bed/fixed-bed reactor was designed to investigate the effects of volatile-char interactions on the volatilisation of alkali and alkaline earth metallic (AAEM) species during the pyrolysis of Victorian brown coal at 900 °C. With the two-stage reactor configuration, the AAEM-free volatiles generated from the pyrolysis of the H-form coal in the fluidised bed came into direct contact with the char from NaCl-loaded or Na-form coals in the fixed bed. The results indicated that the interactions between the volatiles, especially free radicals in the volatiles, and the char particles enhanced the volatilisation of Na from the char drastically. However, such radical-char interactions resulted in little volatilisation of Mg and Ca, indicating the importance of valence of the AAEM species. The degree of the volatile-char interactions was also related to the ageing of the char and the chemical form of AAEM species in the coal substrate. The volatiles interacted more strongly with the nascent char than the aged char, indicating that the AAEM species existed in the aged char in more stable forms than in the nascent char.