As discussed in the previous paper (Part 1), the Minamiaga "paraffin" is featured by a relatively large quantity of carboid and a small quantity of petrolene contents. Owing to the peculiarity of the "paraffin", special consideration should be given to prevent the "paraffin" trouble.
Laboratory experiments for deposition and inhibition of the "paraffin" were carried out on Minamiaga crude oil with available chemicals having surface activity. To mitigate the trouble, an addition of chemicals like petrolene was expected to be effective because petrolene (which was extracted from other crude oil) added to Minamiaga oil had revealed the tendency to reduce the deposition of solid. Among the 11 materials tested, two chemicals were selected. One was pour point reducer, the main component of which was alkylnaphthalene, and the other was sludge disperser, and the mixture of the two (in the ratio of two to one) showed better effect than in the case of separate application.
Following the laboratory tests, field test was run at the Minamiaga field. The well stream of Minamiaga-28W was divided into two equal flows at the well-head, then the mixture of the said two chemicals were added continuously at the rate of 300ppm to one of the streams. (There took place some intermittent interruptions due to mechanical reasons.) The none additive flow was for a blank test. The experiment lasted for 108 days in winter season. The result of the field test was favorable in spite of the interruptions of chemical addition into the crude oil.
It would be reasonable to establish a hypothesis that some kinds of alkylnaphthalene act as an inhibitor for coagulation precipitation of solid by bridging carboid with liquid oil. Consequently, the Minamiaga "paraffin" trouble should be prevented by adding the inhibitor.

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The commercial pour point depressant Paraflow was separated by rubber membrane dialysis and the molecular structure of the most effective component in Paraflow, i. e. the residue of rubber membrane dialysis was analyzed by IR, MS, NMR and GPC. As the results, the most effective component as pour point depressant was found to exist 14wt% in Paraflow and their mean molecular weight was 6, 100 and their mean molecular structure was considered to be as following:
x: Degree of polymerization, about 6
And there were some fractions having 20, 000 molecular weight in Paraflow.

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Authors prepared three lubricating base oils having different pour points (0°, -5°, -10°C) by dewaxing of solvent refined waxy raffinate, and then three kinds of representative commercial pour point depressants (naphthalene-chlorinated paraffin condensation product, phenol-chlorinated paraffin condensation product and polyalkylmethacrylate) were added to them in the concentration range of 0.10.5wt%. Thereby the authors measured the ordinary pour points, Federal test method (cycle C) pour points and observed the pour point reversions.
Variance analysis of experimental values showed that Federal test method pour points depended upon the dewaxing temperatures and kind of additives but not affected by the quantity of additives, while the pour point reversions were influenced by these three factors.
Generally, pour point reversions were higher for the samples prepared from base oils of higher pour point.

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Pour point reversions of various lubricating oils containing one of three different type pour point depressants (naphthalene-chlorinated paraffin condensation product, phenol-chlorinated paraffin condensation product and polyalkylmethacrylate) were measured by sudden cooling-heating cycle method and Federal test method.
In the former test any pour point reversion was not recognized, but in the latter test a 2.57.5°C range of the pour point reversions was observed in all cases.
Polyalkylmethacrylate gave the most effective pour point depressions and the most stable pour point reversions among the additives.

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The pour point depressant (W-1), which was synthesized by Friedel-Crafts reaction of naphthalene and chlorinated paraffin using AlCl₃ as catalyst according to author's water addition method, has excellent depression ability. Then, depressant W-1 was separated by rubber membrane dialysis and liquid adsorption chromatography, and the molecular structure of the most effective component in W-1, i. e. the residue of rubber membrane dialysis was analyzed by IR, MS, NMR and GPC. As the results, the most effective component as pour point depressant was found to exist 20wt% in W-1 and their mean molecular weight was 5, 100 and their mean molecular structure was considered to be a mixture of the following:
x: Degree of polymerization, about 8
And there were some fractions having 20, 000 molecular weight in W-1.
The formation mechanism of such high molecular weight substances was discussed.

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絶縁油は大部分, の低いナフテン系原油より製造されているが, 世界的に不足する傾向にある。そこで中東系原油から絶縁油を製造する場合の問題点を調べた。ナフテン系油と比べてろう分が多くが高いので, 降下剤の配合油を含め低温性能を検討した。また精製条件を検討して絶縁油の硫黄分および芳香族分と酸化安定性, 腐食性硫黄および水素ガス吸収性などとが密接な関係にあることがわかった。その結果, 中東系油の芳香族分を20%前後となるよう精製し, また硫黄分を0.1～0.3wt%とし, これにアルキルベンゼンを30vol%混合することにより, 絶縁油に要求されるこれらの諸特性をすべて満足する良好な絶縁油が得られた。

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