In order to find an effective process for fabricating exfoliate graphite without sulfur , the different methods have been investigated in this paper 本文从膨胀石墨的制备工艺出发，旨在找寻一种在无硫酸的介入下制备膨胀石墨的工艺，达到无有害硫残余的目的。
This method has been used for many times and similar operation time and product are obtained as that using the treatment with a mixture of sulfuric acid , nitric acid and fuming sulfuric acid 经过多次试用，其操作时间和得到的结果，与以前使用的硫酸、硝酸加发烟硫酸的方法基本相同。
Some coumarin derivatives are synthesized through pechmann reaction with catalytical amount of sulfuric acid . microwave irradiation is used and moderate to excellent results are got . the method is also very fast and convenient 在催化量硫酸的存在下，用微波辐射进行pechmann反应，制备香豆素衍生物，获得中等至良好的产率。本方法快速方便。
The coating effects of these modifiers are evaluated in the order of ( napoa ) 6 > c2hsoh > na2sio3 > h2o > naoh . the organic modification reagent such as sodium stearate and polyethylene glycol can modify the nanosized powders , sodium stearate has good effect when its adding amount to nano - tio2 is 8 % , the concentration is about 0 . 1 mol / l , the value of ph is 5 , and the reaction period is up 30 minutes . to modify the powders with polyethylene glycol , the amount must be limited from 1 % to 2 % , the value of ph is between 3 and 5 , and the reaction period should be up to 2 hours , the effect will be mo 不同分散剂对其分散效果为: ( napo3 ) 6 > czhsoh > n处5103 > hzo > naoh ;采用有机改性剂硬脂酸钠和聚乙二醇进行了纳米二氧化钦的有机改性研究，获得了改性剂用量，浓度等最佳工艺条件的参数;对纳米二氧化钦进行了包裹二氧化硅的研究，适当调整溶液的ph值，滴加硫酸的速度，以及改变滴加方式，获得了较致密的包覆二氧化钦，其分散性和酸溶性都获得了较大程度的改善。
To determine the vitriolic solute quality mark in sewage does following tests : take 10 grams this sewage , chase to the middle of sewage drop join solute quality mark to change sodium solution for the oxyhydrogen of 4 % , if plan institute is shown , the ph change of the quality of solution of natrium of oxidation of place drop hydrogenation and solution concerns 为测定污水中硫酸的溶质质量分数做如下实验：取10克该污水，向污水中逐滴加入溶质质量分数为4 %的氢氧化钠溶液，所滴加氢氧化钠溶液的质量与溶液的ph变化关系如图所示。
It is proved that the new technology is feasible , but 4 important problems must be solved by test , viz , behavior of iron ion in anode ; influence of iron in electrolyte on current efficiency , cathode quality , and the allowable concentration of iron ion ; the optimal concentration of sulphuric acid in electrolyte ; the optimal method of removing iron ion in electrolyte 但是要进行工业生产，必须经过试验研究，解决好4个问题，即阳极中铁的行为；电解液中的铁离子对电流效率的影响和阴极析出质量的影响，铁离子的最高允许浓度是多少；电解液中硫酸的最佳浓度是多少；电解废液中的铁离子采用什么方法进行净化最经济。
