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Volume 14, Issue 7
Displaying 1-6 of 6 articles from this issue
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Harumichi Watanabe1971 Volume 14 Issue 7 Pages 489-491
Published: July 25, 1971
Released on J-STAGE: January 30, 2009
JOURNAL FREE ACCESSThree succinimides having different amino groups were evaluated by CRC-LTD engine test. The succinimide which has more basic nitrogens shows better test results. Test results were obtained in the following order, with succinimide-A giving the best results;
succinimide-A>succinimide-B>succinimide-C.
These results are consistent with the mechanism of additive action previously proposed by the author.View full abstractDownload PDF (1926K) -
Prevention of Coke Formation in the Cooling SectionMikio Ueda, Shigenori Suzuki, Takanobu Shiozaki, Tokuji Ozawa1971 Volume 14 Issue 7 Pages 492-498
Published: July 25, 1971
Released on J-STAGE: January 30, 2009
JOURNAL FREE ACCESSThe primary purpose of this investigation was to prevent carbon or coke formation on the quenching tube by the vortex action of fluidized bed of sand which serves as a decoking medium by direct contact with the cracked gas and quenching tube. Also, carbon or coke deposit in the transfer line was studied.
From the discussion on the use of Minas crude oil feed, the following conclusion may be drawn:
1. There was no carbon or coke deposit on the quenching tube at the operating temperature of fluidized bed above 500°C. Up to the temperature of 500°C, however, carbon or coke deposit was influenced by the tube skin temperature. Briefly, if the tube skin temperature is above 390°C, carbon or coke deposit on the quenching tube surface can be repressed, and it is more effective if the coolant flows parallel with the cracked gas. 2. Carbon or coke depositted in the transfer line above 400°C looked like soot, and under 400°C it was like tar. In case of the linear velocity of 60m/sec in the transfer line, carbon or coke deposit can be prevented if the grains of sand content in the carbon or coke catched in the cyclone is above 30wt%.View full abstractDownload PDF (3218K) -
Data Processing of High Resolution Nuclear Magnetic Resonance and Analysis of PhosphatesShozo Oshima, Koichi Asano, Takao Nishishita, Hiroshi Tsuji, Hiroshi Y ...1971 Volume 14 Issue 7 Pages 499-503
Published: July 25, 1971
Released on J-STAGE: January 30, 2009
JOURNAL FREE ACCESSThis paper presents an analytical method to investigate some acidic phosphate esters (mono-, di-, tri-alkyl phosphates) by a nuclear magnetic resonance spectroscopy on 31P nuclei.
These alkyl phosphates in the experiment have shown their chemical shifts to be very close to each other and the sensitivity of 31P is generally low. We have solved the former problem by adding two volumes of di-(2-ethyl hexyl)-amine to one volume of sample of alkyl phosphate mixtures. For the latter, time averaging S/N improvement by a digital computer was carried out.
The subject of processing includes a multi-scan averaging or CAT (computer of average transients), smoothing of accumulated data and off-line data processings which cover the print out of peak positions, peak areas and their percent ratios, chemical shifts, and spin-coupling constants.
The communication with the system is supported by a teletype and an operator unit which facilitates the spectrometer. The performance of the system has proved to be very satisfactory.View full abstractDownload PDF (335K) -
Tatsuo Ono1971 Volume 14 Issue 7 Pages 504-508
Published: July 25, 1971
Released on J-STAGE: January 30, 2009
JOURNAL FREE ACCESSThe IP Test Method has been commonly used for the determination of the asphaltene content in residual fuel oils. But more rapid method is desirable, because the method is not only complicated in its operation but also it takes a long time in its determination. From the results of investigation on operating conditions, we have established the following rapid method: add n-heptane at the ratio of 20ml to each one of sample; allow it to stand for one hour at room temperature and remove asphaltene by hot filtration. It has been found that the accuracy of the rapid method and its correlation with IP Test Method is good.View full abstractDownload PDF (358K) -
Masashi Iino, Yasuo Hirose, Mitsuho Hirata1971 Volume 14 Issue 7 Pages 509-511
Published: July 25, 1971
Released on J-STAGE: January 30, 2009
JOURNAL FREE ACCESSThis paper describes on a distillation which reduces the water content of hydrocarbon (benzene, n-hexane and toluene) from 700 to less than 50ppm. The distillation was carried out in a 50mm dia., 1, 300mm high packed column with 10 theoretical plates. The distillate was collected in a new type decanter at the top, the lower aquesous layer being withdrawn and upper layer being refluxed to the column. Dry hydrocarbon was obtained from the bottom.
As a result of the distillation, it has been confirmed that water in the hydrocarbon can be reduced to less than 50ppm. The actual efficiencies of the distillation were very low, measured H.E.T.P. (Height Equivalent to a Theoretical Plate) being 11.0∼13.0m in the n-hexane-water system, 1.5∼1.6m in the benzene-water system and 7.0∼9.0m in the toluene-water system. In addition, experimental data are measured on the isobaric three vapor-liquid equilibrium of the systems; n-hexane-water, benzene-water and toluene-water, in the region of low water concentration.View full abstractDownload PDF (250K) -
1971 Volume 14 Issue 7 Pages 528
Published: 1971
Released on J-STAGE: January 30, 2009
JOURNAL FREE ACCESSDownload PDF (94K)
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