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蒸汽爆
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  steam explosion
    Studies on Steam Explosion of Wheat Straw──Ⅰ.Effects of the Operating Coditions for Steam Explosion of Wheat Straw and Analysis of the Process
    麦草蒸汽爆碎处理的研究──Ⅰ.影响麦草蒸汽爆碎处理因素及其过程分析
短句来源
    By means of uniform and rotating regression design optimal steam explosion conditions for the ligno-cellulosic waste,namely the fibrous trash from material preperation of a paper mill ,and the effects of steam pressure,holding time and acid addition on hemicellulose recovery and enzymatic susceptibility of cellulosic residue were investigated.
    采用均匀设计和旋转回归设计序贯形式,对纤维性废物——造纸厂麦秸备料废渣的蒸汽爆碎预处理条件进行了优化。 发现蒸汽爆碎条件对纤维废物的纤维素可酶解性和半纤维素抽提得糖率的影响明显不同。
短句来源
  “蒸汽爆”译为未确定词的双语例句
    STEAM EXPLOSION PRETREATMENT OF LIGNOCELLULOSIC WASTE AND WATER EXTRACTION OF HEMICELLULOSE HYDROLYSATE
    纤维性废物蒸汽爆碎预处理和半纤维素水解物的水抽提
短句来源
    Bagasse and chopped poplar wood were used as substrates for studying the effects of pretreat-ments on enzymatic hydrolysis of cellulose.
    以酸、碱及蒸汽爆碎预处理的蔗渣、杨树作底物,进行纤维素酶解(50℃、24h)试验,其中以碱预处理的蔗渣得糖率为最高。
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  steam explosion
The phenomenon of steam explosion takes an important place in the analysis of severe accidents in nuclear power generation.
      
The intensity of steam explosion defines the scenario of further course of an accident.
      
A comparison with experiment confirms the validity of this approach to solving the problem on intensity of steam explosion.
      
Only the mixing of a corium jet with water at different values of pressure is studied in experiments L-14 and L-24; in experiment L-33, an initiating device is used to make a steam explosion after mixing.
      
The results of VAPEX code-aided calculations and the experimental data agree qualitatively and quantitatively both at the stage of mixing and at the stage of steam explosion.
      
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By means of uniform and rotating regression design optimal steam explosion conditions for the ligno-cellulosic waste,namely the fibrous trash from material preperation of a paper mill ,and the effects of steam pressure,holding time and acid addition on hemicellulose recovery and enzymatic susceptibility of cellulosic residue were investigated. It was found that 1. 5-1. 6 MPa,17- 18 min and with no acid addition were proper conditions for both. The mechanism of steam explosion was preliminarily studied.

采用均匀设计和旋转回归设计序贯形式,对纤维性废物——造纸厂麦秸备料废渣的蒸汽爆碎预处理条件进行了优化。发现蒸汽爆碎条件对纤维废物的纤维素可酶解性和半纤维素抽提得糖率的影响明显不同。综合考虑两者,认为罐压为1.5~1.6MPa,维持17~18min后喷放为最佳条件。初步分析了汽爆预处理的机理。此外对影响汽爆材料中可溶性半纤维素水解物水抽提的因素进行了研究。发现在汽爆材料浓度为15%和热水抽提条件下,抽提3~4次可达到较理想的抽提效果。采用重复式或连续式抽提工艺,可获得糖浓度不同(16.0~47.7g/L)的水抽提液,其糖组成分析显示,木糖占总糖的85.9%,单糖与寡糖之比为1:9。

Bagasse and chopped poplar wood were used as substrates for studying the effects of pretreat-ments on enzymatic hydrolysis of cellulose. Pretreatments by acid ,alkali and steam-explosion and enzymatichydrolysis at 50℃ for 24 h were adopted in the experiments, Pretreated materials were analysed by de-terming total sugar,sugar fraction and lignin contents in the hydrolyzates. The crystallinity of bagasse andpoplar before and after pretreatments was estimated by X-ray diffraction。 Effects of different pretreatrnentson...

Bagasse and chopped poplar wood were used as substrates for studying the effects of pretreat-ments on enzymatic hydrolysis of cellulose. Pretreatments by acid ,alkali and steam-explosion and enzymatichydrolysis at 50℃ for 24 h were adopted in the experiments, Pretreated materials were analysed by de-terming total sugar,sugar fraction and lignin contents in the hydrolyzates. The crystallinity of bagasse andpoplar before and after pretreatments was estimated by X-ray diffraction。 Effects of different pretreatrnentson variations of composition and enzymatic hydrolysis of cellulosic materials were seen from the results andthe total utilization of biomass of these materials was tentatively discussed.

以酸、碱及蒸汽爆碎预处理的蔗渣、杨树作底物,进行纤维素酶解(50℃、24h)试验,其中以碱预处理的蔗渣得糖率为最高。通过测定不同原料不同预处理方法得到的水解液的总糖、糖组分及紫外吸收;分析不同预处理所引起的植物纤维组成变化、同时对预处理前后的蔗渣和杨树进行了x-衍射分析测定,从结晶度的变化综合分析了预处理对纤维素酶降解的影响,并对植物纤维生物量的全利用进行了初步探讨。

Dilute acid pretreatment, ammonia steeping pretreatment (ASP) and stream explosion process (SEP) of biomass are reviewed. All the pretreatments have effects on the physical feature, morphology and composition of ligno-cellulose. Dilute acid pretreatment can hydrolyze hemicellulose to xylose. ASP of biomass can solubilize lignin and increase pore size of substract. SEP of biomass can remove hemicellulose and lignin seal, and enhance conversion of the cellulose to glucose by cellulase.

对植物纤维素原料的预处理方法进行了综述。物理方法中,机械粉碎是较常用的方法,但耗能较多;稀酸预处理能有效去除半纤维素,效率较高,但稀酸处理能耗较多且对设备的防腐要求较高;蒸汽爆碎处理能有效地分离纤维素、半纤维素和木质素,所处理物料酶解转化率高,但处理过程需专用设备和过程中所产生的一些对微生物有抑制作用的物质将影响其应用范围;氨处理所需条件温和,能有效地去除木质素,是一种较有潜力的预处理方法。

 
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