共查询到20条相似文献,搜索用时 171 毫秒
1.
对利用不同生物柴油副产物粗甘油发酵生产1,3-丙二醇的试验条件进行了研究。批次发酵试验结果表明:精制甘油(纯度98%)、生物柴油副产物粗甘油A(纯度83%)和B(纯度78%)及C(纯度68%)生成1,3-丙二醇的转化率分别为52.38%、48.08%、45.22%、39.95%;精制甘油、粗甘油A和B及C的流加补料发酵合成1,3-丙二醇的转化率分别为51.45%、44.63%、41.27%、35.39%。经济效益粗略评估分析表明,生物柴油副产物粗甘油A和B生产单位1,3-丙二醇较精制甘油成本低,生物柴油副产物粗甘油C却较精制甘油成本高。 相似文献
2.
3.
4.
5.
由于石油资源的日益紧缺,生物柴油正成为研究热点。但是,生物柴油生产时的副产品粗甘油造成的污染又对经济和环境提出了挑战。微生物能够利用生物柴油生产的副产品甘油制造石油化工行业的许多产品。 相似文献
6.
7.
8.
提出了以生物柴油副产物甘油为萃取剂脱除粗生物柴油中碱催化剂KOH的新工艺。测定了不同温度条件下KOH在甘油和精制生物柴油中的溶解度,考察了KOH用量、甲醇和原料油种类对KOH在甘油/生物柴油体系中的分配系数的影响。结果表明:KOH在甘油中属于易溶,而在精制生物柴油中属于微溶,甘油可作为KOH的优良萃取剂;随着碱催化剂KOH用量的增大,KOH在甘油/生物柴油体系中的分配系数逐渐减小;甲醇的存在,减小了KOH在甘油/生物柴油体系中的分配系数;原料油中的杂质成分对KOH在甘油/生物柴油体系中的分配系数影响较大,制备的粗生物柴油中皂化物、胶质越多,分配系数越小。 相似文献
9.
10.
11.
12.
13.
粗甘油是生物柴油生产中的一个主要副产物,而通过微生物可将粗甘油转化为高附加值的1,3-丙二醇。1,3-丙二醇在食品、化工、医药、化妆品等很多领域具有非常广泛的应用。本文从1,3-丙二醇的粗甘油生物转化的迫切性、生产的菌种、合成的途径、合成的基因、发酵转化以及生产中的问题与策略等方面综述了微生物发酵粗甘油生成1,3-丙二醇的最新研究进展。 相似文献
14.
实验利用生物柴油副产物甘油为碳源,培养畸雌腐霉(Pythiumirregulare)发酵生产EPA。实验中所用废甘油为利用碱法催化大豆油与甲醇进行酯交换反应生成,粗甘油经过纯化精制作为碳源。EPA产量采用气相色谱分析,分析之前采用浓硫酸-甲醇酯化法进行脂肪酸甲酯化。由实验得出,最佳发酵条件为:温度为25℃,pH为6,转速为170r/min,粗甘油加入量为70g/L,此条件下获得的EPA产量为:105mg/L。 相似文献
15.
Hydrogen and ethanol production from glycerol-containing wastes discharged after biodiesel manufacturing process 总被引:5,自引:0,他引:5
Ito T Nakashimada Y Senba K Matsui T Nishio N 《Journal of Bioscience and Bioengineering》2005,100(3):260-265
H2 and ethanol production from glycerol-containing wastes discharged after a manufacturing process for biodiesel fuel (biodiesel wastes) using Enterobacter aerogenes HU-101 was evaluated. The biodiesel wastes should be diluted with a synthetic medium to increase the rate of glycerol utilization and the addition of yeast extract and tryptone to the synthetic medium accelerated the production of H2 and ethanol. The yields of H2 and ethanol decreased with an increase in the concentrations of biodiesel wastes and commercially available glycerol (pure glycerol). Furthermore, the rates of H2 and ethanol production from biodiesel wastes were much lower than those at the same concentration of pure glycerol, partially due to a high salt content in the wastes. In continuous culture with a packed-bed reactor using self-immobilized cells, the maximum rate of H2 production from pure glycerol was 80 mmol/l/h yielding ethanol at 0.8 mol/mol-glycerol, while that from biodiesel wastes was only 30 mmol/l/h. However, using porous ceramics as a support material to fix cells in the reactor, the maximum H2 production rate from biodiesel wastes reached 63 mmol/l/h obtaining an ethanol yield of 0.85 mol/mol-glycerol. 相似文献
16.
17.
Single cell oils (SCO) produced from oleaginous microorganisms are a potential alternative oil feedstock for biodiesel production. The worldwide production of glycerol, a 10% (w/w) byproduct produced in the transesterfication process of oils converted to biodiesel, is increasing as more biodiesel is being produced. For the purposes of cost reduction, crude glycerol was regarded as a suitable carbon source for the cultivation of Rhodotorula glutinis. In addition to using renewable crude glycerol, waste solution collected from the brewing company (called thin stillage) was adopted as a substitute to replace a costly nitrogen source used in the medium. The results of using mixture of crude glycerol and thin stillage indicated about a 27% increase in total biomass as compared to that of using crude glycerol with a standard medium. Using glycerol instead of glucose as the carbon source could also alter the lipid profile, resulting in an increase in linolenic acid (C18:2) to comprise over 20% of the total lipid. Successfully using renewable crude glycerol and thin stillage for the cultivation of oleaginous microorganisms could greatly enhance the economic competition of biodiesel produced from SCO. 相似文献
18.
Biodiesel fuel production by transesterification of oils 总被引:41,自引:0,他引:41
Biodiesel (fatty acid methyl esters), which is derived from triglycerides by transesterification with methanol, has attracted considerable attention during the past decade as a renewable, biodegradable, and nontoxic fuel. Several processes for biodiesel fuel production have been developed, among which transesterification using alkali-catalysis gives high levels of conversion of triglycerides to their corresponding methyl esters in short reaction times. This process has therefore been widely utilized for biodiesel fuel production in a number of countries. Recently, enzymatic transesterification using lipase has become more attractive for biodiesel fuel production, since the glycerol produced as a by-product can easily be recovered and the purification of fatty methyl esters is simple to accomplish. The main hurdle to the commercialization of this system is the cost of lipase production. As a means of reducing the cost, the use of whole cell biocatalysts immobilized within biomass support particles is significantly advantageous since immobilization can be achieved spontaneously during batch cultivation, and in addition, no purification is necessary. The lipase production cost can be further lowered using genetic engineering technology, such as by developing lipases with high levels of expression and/or stability towards methanol. Hence, whole cell biocatalysts appear to have great potential for industrial application. 相似文献
19.
20.
旨在为生物柴油后处理阶段的超临界CO2提纯工艺提供参考数据,以生物柴油生产过程中后处理阶段体系所含的油酸、无水乙醇及甘油为原料,通过在SYLG-01型超临界流体相平衡实验装置中,观察油酸-甘油-无水乙醇共混体系在温度为308 K下与CO2达到相平衡状态的过程。结果表明,油酸-甘油-无水乙醇共混体系为液-液两相,与CO2在相平衡实验装置内最开始是气-液-液态,随着压力的增加,当CO2达到超临界状态时,不同相之间的流动性和传递性增强,共混体系变成了均一态。因此,改变超临界CO2的压力,有望将体系中的游离脂肪酸和副产物甘油同时萃取分离。 相似文献