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    ZSM-5 and USY,which are catalysts widely used by petroleum plants,and the new modified catalyst of DeLaZSM-5 were used as catalysts for catalytic cracking of the mixture of Low-density polyethylene(LDPE)and polystyrene(PS)and their catalytic cracking behaviors have been studied systematically. The results showed that the degradation activities of LDPE/PS were improved when using ZSM-5 and DeLaZSM-5 compared with those of thermal degradation,i. e.
    研究ZSM 5和USY,及新型改性催化剂DeLaZSM 5对LDPE与PS混合聚烯烃的催化裂解行为,与热裂解相比,ZSM 5与DeLaZSM 5使裂解速率增加、残渣收率降低、产品分布变窄,而USY使裂解活性降低,其中De LaZSM 5对LDPE/PS混合物具有最高的催化裂解活性。
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  product slate
Anthraquinones produced by suspension cultures of Cinchona ledgeriana are released into the medium, which becomes saturated with products late in the growth cycle.
      
Compared to the hydrocarbon product slate from heterogeneous HDS catalysis, cracking and hydrogenation are more prevalent in the homogeneous reaction.
      
Depending on the alcohol product slate desired and the type of catalyst used, the appropriate ratio will vary.
      
Figure 30 shows the various processing alternatives, with the product slate and product quality dictating the viable options.
      
However, suppose surveys indicate that customers who receive products late will probably never shop at our stores again.
      
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It is an important issue in oil industry to realize clean production of fuel.To reach this goal, painstaking efforts must continue to work in catalysts, technics as well as research and development of products. Based on clean-production fuel refineries and existing technical development,the paper points out the orientation for the study and development of alternate technology and compares product distribution, cost as well as benefits between conventional refineries and clean-production refineries.

实现燃料的清洁生产是石油工业的重要课题 ,为实现清洁生产的目标必须在催化剂、工艺及产品的研究开发上继续努力工作。在生产清洁燃料的炼厂及现有技术发展的基础上 ,指出了替代技术的研究开发方向 ,并对常规炼厂和清洁炼厂的产品分布、成本及效益进行了比较。

ZSM-5 and USY,which are catalysts widely used by petroleum plants,and the new modified catalyst of DeLaZSM-5 were used as catalysts for catalytic cracking of the mixture of Low-density polyethylene(LDPE)and polystyrene(PS)and their catalytic cracking behaviors have been studied systematically.The results showed that the degradation activities of LDPE/PS were improved when using ZSM-5 and DeLaZSM-5 compared with those of thermal degradation,i.e.faster degradation rate,lower residue yield and much narrower product...

ZSM-5 and USY,which are catalysts widely used by petroleum plants,and the new modified catalyst of DeLaZSM-5 were used as catalysts for catalytic cracking of the mixture of Low-density polyethylene(LDPE)and polystyrene(PS)and their catalytic cracking behaviors have been studied systematically.The results showed that the degradation activities of LDPE/PS were improved when using ZSM-5 and DeLaZSM-5 compared with those of thermal degradation,i.e.faster degradation rate,lower residue yield and much narrower product distribution,while the degradation activities were hindered when using USY.Besides,the highest activities were obtained over the new modified catalyst DeLaZSM-5.

研究ZSM 5和USY,及新型改性催化剂DeLaZSM 5对LDPE与PS混合聚烯烃的催化裂解行为,与热裂解相比,ZSM 5与DeLaZSM 5使裂解速率增加、残渣收率降低、产品分布变窄,而USY使裂解活性降低,其中De LaZSM 5对LDPE/PS混合物具有最高的催化裂解活性。

>=Distribution of cadmium in goat whole milk and its products was studied before and following a repeated oral cadmium administration to 3 goats.Prior to cadmium administration,milk cadmium levels ranged from less than 0.2 to 0.2μg/L.during cadmium administration,cadmium levels ranged from 1.2 to 4.6μg/L in the milk used for cheese making.The factor of concentration of cadmium from whole milk to cream was 3.1±0.7,to lactic curds was 3.3±0.3 and to rennet curds was 5.7±0.7.A quarter of the cadmium contained in...

>=Distribution of cadmium in goat whole milk and its products was studied before and following a repeated oral cadmium administration to 3 goats.Prior to cadmium administration,milk cadmium levels ranged from less than 0.2 to 0.2μg/L.during cadmium administration,cadmium levels ranged from 1.2 to 4.6μg/L in the milk used for cheese making.The factor of concentration of cadmium from whole milk to cream was 3.1±0.7,to lactic curds was 3.3±0.3 and to rennet curds was 5.7±0.7.A quarter of the cadmium contained in the original milk was found in the cream(23.9±5.4%),about 60% in curd(61.6±5.4%) in rennet curds and 56.8±4.8% in lactic curds),12.9±2.8% in rennet curd whey and 16.3±5.3% in lactic curd whey.

通过对3只泌乳山羊连续服用镉,研究了镉在山羊全乳及乳产品的分布。试验羊摄入镉之前,乳镉浓度为<0.2-0.2 μg/L,摄入镉期间,乳镉浓度为1.2~4.6 μgL,在奶油中镉的浓度是原始乳镉的3.1±0.7倍,在用酸化法和加酶法制作的奶酪中的镉分别是原始乳镉的3.3±0.3倍和5.7±0.7倍。原始乳中的镉,大约1/4(23.9±5.4%)分布在奶油中,大约60%分布在奶酪中(61.6±5.4%)分布在用加酶法制作的奶酪中,56.8±4.8%分布在用酸化法制作的奶酪中),分布在两种乳清中的镉分别为12.9±2.8%和16.3±5.3%。

 
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