The optimal operating conditions for SRNA-4 in the MSB gasoline desulfurization system included the nitrogen pressure of 1.0 MPa,the adsorption temperature of 100℃,the LHSV of 12 h-1 and the Hext of 20 kA/m.
As an ideal device for acidizing and fracturing in oilfields,the new pump uses the performance parameters(pressure and displacement)of one kind of plunger to cover the performance parameters of various plungers of three-cylinder plunger pump for cementing and fracturing.
Experimental results show that sulfur content in the treated diesel can be lowered from 1441 μg/g to 262 μg/g with desulfurization efficiency of 81. 8 % when using Al22O3 as oxidizing catalyst and furfural solution containing water as desulfurization catalyst and extractant under the following condition: speed of agitator 700 r/min. amount of catalyst 5% , reaction temperature 140 ℃, reaction time 90 min and oxygen pressure 0.6 MPa.
And under the optimal reaction conditions,the conversion of soybean oil is 53%. At the same time,the reactant mixing state has an important influence on the transesterification and the conversion. Tetrahydrofuran,a co-solvent added to the reaction system,has an beneficial effect on the transesterification and can increase the conversion of soybean oil from 36% to 75% when the temperature is 360 ℃ and the molar ratio of tetrahydrofuran to methanol is 0.04∶1.
The operation adj on matrices arises from the (n - 1)st exterior power functor on modules; the analogous factorization question for matrix constructions arising from other functors is raised, as are several other questions.
The operation number of the stable doubleLR algorithm for normative matrices is only four sevenths of the rationalQR algorithm for real symmetric tridiagonal matrices.
Two-operation homomorphic perfect sharing schemes over rings
Two-operation homomorphic sharing schemes were introduced by Frankel and Desmedt.
They have proved that if the set of keys is a Boolean algebra or a finite field, then there does not exist a two-operation homomorphic sharing scheme.
The key point regarding the safety consideration of internal floating roof tank for storing petroleum and its products is the seal between the floating roof periphery and tank shell. The seal should fit tightly against the shell all around and the floating roof should move smoothly both up and down.Good ventilation and accurate monitoring for the gas mixture above the floating roof are also of critical importance.
The jet condenser pump coupled with both air and indirect water cooling systems was successfully used on top of vacuum tower in place of the conventional barometric-jet condenser. The average vacuity was maintained at 700 mm Hg or 696 mmHg under high throughput(above 9258 T/D). The energy consumption was reduced by 1.188 MM kcal/hr. The operating cost was reduced significantly although the initial investment was higher than that of the conventional system. The pay-off time is less than 3 years.