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1. The best choice for separating the isomers of dichlorobenzene is the adsorption separation by zeolite adsorbents in high efficiency.

2. Objective: To evaluate the toxicity of camphor ball (dichlorobenzene as major component) on reproduction.

3. Present domestic production processes of dichlorobenzene are systematically introduced, pointing out their advantages and shortcomings.

4. The p dichlorobenzene and naphthalene in mothproofing agent was determined by infrared spectroscopy.

5. The determination ofp - dichlorobenzene, o - dichlorobenzene, m- dichlorobenzene, 1 , 2,4 - trichlorobenzene and chlorobenzene by gas chromatography under the same conditions was introduced.

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6. An effective 1,3 dichlorobenzene degrading strain PF 11 from benzene utilizing bacteria isolated from town gas industrial effluent by genetic breeding was introduced.

7. The producing technology ofp - dichlorobenzene especially the catalysts are described in this thesis.

8. The Measurement of Solid-Liquid Equilibrium For Dichlorobenzene Isomers and 1, 2, 4-trichlorobenzene Systems.

9. By the starting material 4 -chloronitrobenzene, 2, 4 - dichlorobenzene was synthesized via fluorination, nitration and chlorination. The total yield was 59. 0%.

10. Two oxidation products of the reaction of C60 with O3 in toluene or dichlorobenzene were obtained in dependence on the amount of ozone absorbed by the solution and the reaction time.

11. The modifications make the determination of the crystallizing point ofp- dichlorobenzene more simply compared with the international standard.