p-nitrotoluene was sulfonated by sulfur trioxide to produce p-nitrotoluene-2-sulfonic acid. the factors which influence the reaction were studied, the purity of the product is above 98%, and the yield is above 96%.

1、

the optimum conditions for synthesizing sodium cyclamate by using sulfur trioxide dioxane as sulfonating agent were investigated. the yield of sodium cyclamate is around 94.8% and the purity is more than 98.2%.

以三氧化硫·二氧六环作磺化剂合成甜味素，取得了最佳工艺条件，总收率可达94.8%，产品纯度在98.2%以上。

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2、

this article outlines the physical and chemical property, production process, product quality standard, process parameter control and operational requirements, etc., for liquid sulfur trioxide, and discusses the technical decisions for the liquid sulfur trioxide plant.

阐述了液体三氧化硫的物化性质、生产工艺、产品质量标准、工艺参数控制及操作要求等，并对液体三氧化硫装置的技术决策进行了探讨。

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3、

pyridine can react with halogens, nitronium fluoroborate, sulfur trioxide, boranes and chromium trioxide to form some useful organic reagents which are introduced briefly in the paper.

吡啶可以和卤素、硝基四氟化硼盐、三氧化硫、硼烷及三氧化铬反应，形成一些有用的有机试剂。

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4、

by film sulfonation with sulfur trioxide, aromatic hydrocarbon of distillate cut oil was sulfonated, and then neutralized, extracted and concentrated to form petroleum sulfonate for the tertiary oil recovery.

采用SO＿3膜式磺化技术，磺化了石油馏分油中的芳烃，磺化产物经中和、萃取和浓缩处理，以制得符合油田三次采油要求的石油磺酸盐产品。

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5、

the method and the technology of synthesizing heavy aromatic petroleum sulfonate by heavy aromatic hydrocarbon and sulfur trioxide and the properties of synthesized product are studied in this paper.

本文研究了采用重芳烃和三氧化硫为原料合成重芳烃石油磺酸盐的方法、工艺及产物性质。

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6、

here is an explanation for the principles and characteristics of measuring the content of sulfide or sulfur trioxide ( so3) in cement.

阐述了测定水泥中三氧化硫含量各种方法的原理、特点等。

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7、

it is feasible that fuming sulfuric acid sulfonating technology is substituted by sulfur trioxide sulfonating technology.

用三氧化硫磺化工艺替代发烟硫酸磺化工艺是可行的。

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8、

the preheated system of sulfonation of sulfur trioxide

三氧化硫磺化预热系统国产化

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9、

determination of liquid-phase sulfur trioxide in wpa slurry by icp-aes

ICP-AES测定湿法磷酸萃取料浆中液相三氧化硫含量

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10、

summary of sulfur trioxide sulfonation model

三氧化硫磺化模型综述

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11、

study of stabilizers for liquid sulfur trioxide

液体三氧化硫稳定剂的研究

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12、

application of sulfur trioxide sulfonating technology to dsd acid production

三氧化硫磺化工艺用于DSD酸生产

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13、

high-speed determination of sulfur trioxide in glass and cement

玻璃和水泥中三氧化硫的高速分析

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14、

production process for liquid sulfur trioxide

液体三氧化硫的生产工艺

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15、

the high-speed analysis on sulfur trioxide in glass

玻璃中三氧化硫的特快分析

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16、

study on reaction conditions of toluene sulfonation with gaseous sulfur trioxide

三氧化硫磺化甲苯反应的工艺条件研究

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17、

the sulfonation technology of the liquid sulfur trioxide was also reviewed.

对液体三氧化硫磺化技术的特点进行了概述。

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18、

research on the application of liquid sulfur trioxide

液体三氧化硫应用问题的探讨

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19、

the research and development of chinese sulfur trioxide sulfonation technology is reviewed.

对我国三氧化硫磺化技术的研究开发进行了回顾。

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20、

the adsorption indicator method to determine rapidly sulfur trioxide in salt cake

吸附指示剂法快速测定芒硝中三氧化硫

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