Cong L.,Shandong Qilu Petrochemical Engineering Co. |
Yu M.-H.,Shandong Qilu Petrochemical Engineering Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2010
The styrene plant in the Plastics Plant of Qilu Petrochemical Co. tends to be backward in its technology applied for more than ten years of operation, which has the disadvantages of high energy and material consumptions, serious corrosion and environmental pollution. Three advanced technologies, i.e. ethylbenzene synthesis, dehydrogenation of ethylbenzene to styrene, and styrene distillation, were integrated in this technical revamping. The capacity of styrene was increased from 60000 t/a to 200000 t/a, thus standing as the first largest plant of styrene designed independently in China. After revamping, the energy conservation effects were obvious, the material consumption was reduced greatly, and the corrosion and environmental pollution problems were thoroughly improved, thus attaining good economic and remarkable environmental benefits.
Yu M.-H.,Shandong Qilu Petrochemical Engineering Co. |
Cong L.,Shandong Qilu Petrochemical Engineering Co. |
Song S.-G.,Shandong Qilu Petrochemical Engineering Co. |
Guo D.-R.,Shandong Qilu Petrochemical Engineering Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2010
There are some problems which exist in the styrene production process in Shandong Qilu Petrochemical Engineering Co. Ltd., which include poor dewatering effect of crude styrene, high energy consumption of steam super-heater, poor mixing degree of cold styrene and hot styrene in the return tank, and the vent gas from most storage tanks directly discharges into atmosphere. Such problems cause a higher loss both in energy consumption and material consumption, it affects a long period of stable operation and environment. After the technical improvement, the problems which exist in the original process has been resolved, and both the energy consumption and material consumption have been reduced.
Wu L.,Shandong University |
Deng W.,Shandong University |
Li C.,Shandong University |
Ren H.,Shandong Qilu Petrochemical Engineering Co.
Petroleum Processing and Petrochemicals | Year: 2014
The VGO fraction(360-480 °C)of middle/low temperature coal tar was prepared by vacuum distillation. The fractions were extracted by heptane to isolate the soluble components that were further separated into four components by column chromatographic separation method using silica gel as adsorbent. Petroleum ether,toluene,ethanol-toluene-ethanol for lotion were used. The best column chromatography conditions were determined by contrasting the recovery ratio, difficulty of component flushing and the split points of elution experiments. Furthermore, the components were identified by means of NMR and elements or molecular weight determination. The results reveal that the contents of saturates, aromatics, polar components and C7-asphaltene in VGO fraction were 13. 28%, 35. 10%, 33. 15%, 18. 21% .respectively and 6. 00% of VGO fraction is paraffin,7. 25% is cycloparaffin and 35. 13% is arene. In addition, the polar components and C7-asphaltene are both constituted by polycyclic aromatic hydrocarbons and large molecule with few short side chains. It is the complexity of these soluble components that is the principal factor for difficulty in the conversion to light fraction of coal tar.
Sun L.-Y.,China University of Petroleum - East China |
Chang X.-W.,China University of Petroleum - East China |
Qi C.-X.,Shandong Qilu Petrochemical Engineering Co. |
Li Q.-S.,China University of Petroleum - East China
Separation Science and Technology | Year: 2011
In this article, the design and optimization procedures of a dividing-wall column for heterogeneous azeotropic distillation (DWC-A) using cyclohexane as an entrainer for ethanol dehydration are investigated. The proposed procedures can detect the optimal values of the design variables and thereby guarantee the minimum energy requirements, which is related to the minimum CO2 emissions and the lowest total annual cost (TAC). Since ethanol and water form an azeotrope under atmosphere pressure, a conventional heterogeneous azeotropic distillation sequence (CHADS), including an azeotropic column and a recovery column, is usually used to perform the ethanol dehydration process. However, due to high energy requirements and equipment investments of CHADS, the TAC is at a relatively high level. DWC-A can be used to eliminate the condenser of the second column and decrease the degree of back-mixing. Both CHADS and DWC-A are simulated with Aspen Plus®, and the results show that DWC-A has an energy saving of 42.17% and the TAC reduction of 35.18% along with higher thermodynamic efficiency and reduction in greenhouse gas emissions. © Taylor & Francis Group, LLC.
Guo X.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology |
Guo X.,Shandong Qilu Petrochemical Engineering Co. |
Yao L.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology |
Huang Q.,CAS Qingdao Institute of Bioenergy and Bioprocess Technology |
Huang Q.,CAS Institute of Process Engineering
Bioresource Technology | Year: 2015
Effects of superficial gas velocity and top clearance on gas holdup, liquid circulation velocity, mixing time, and mass transfer coefficient are investigated in a new airlift loop photobioreactor (PBR), and empirical models for its rational control and scale-up are proposed. In addition, the impact of top clearance on hydrodynamics, especially on the gas holdup in the internal airlift loop reactor, is clarified; a novel volume expansion technique is developed to determine the low gas holdup in the PBR. Moreover, a model strain of Chlorella vulgaris is cultivated in the PBR and the volumetric power is analyzed with a classic model, and then the aeration is optimized. It shows that the designed PBR, a cost-effective reactor, is promising for the mass cultivation of microalgae. © 2015 Elsevier Ltd.