puma shoes The production of polyether polyol to d

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The production of polyether polyol to determine the best aging time

Time is only the conversion rate of relationship, nothing to do with the initial concentration, but the actual production of the total conversion rate for the pursuit of the improvement requirements of the transformation is not cured after a minimum amount of propylene oxide. Taking into account the equipment operating costs, making the lowest cost of production, actual production is the ultimate goal. Extended aging time, increase product yield, but water, electricity, gas and other operating costs increase, therefore, investigated the relationship between them will be able to find an optimal curing time allowing for the lowest cost. Table 1,[link widoczny dla zalogowanych], a brand for the company polyether calculated and measured values of the comparison. Wrapped in a theoretical total value-ff Huang Shu-value real compare products at the end of feeding time when the L values calculated aging 4h measured relative error,% of measured values of relative error,% intermediate 3.3963.3351.8290.2820 .2791.075 finished 1.9051.8811.2760.1570.1551.290 data can be seen from Table 1, the calculated and measured values is not, more in line with the actual situation. Error is mainly due to polymerization reactor vapor space due to propylene oxide. 3 When asked to determine the best curing usually the production of polyether, the reaction time is much less than the refined processing time. Reactor time normally does not affect the productive capacity of the device. Therefore, to obtain a higher yield can be increased response and ripening time, without affecting device yield. The following are obtained according to the actual situation of the reactor operation time and operating costs of the relationship. Y = 105t. Where: y. During the reactor for the aging operating costs, Yuan (including water, electricity, gas, labor and other costs); ? for the reactor operating time, h. The reaction of propylene oxide is not the cost of the loss (in polyether price of 8,000 yuan, t) dollars, dollars. Y ~ = 13900 [Mo]. [Mendelevium the end of the ripening of propylene oxide concentration,[link widoczny dla zalogowanych], mol / kg reaction mixture. Therefore, the total cost: yy. + Yoo = lO5t +13900 [Mo] that: Y ~ = lO5t +13900 [Mi] e-Kt ~ To make the total cost of the minimum, the following equation to be solution: dYJdt = 105 +13900 [Mo] (-K [cat]) e-~ = Ot =- (K [cat]) In (105 / (13900 [Mo] k [cat])) as the best aging time on the type formula,[link widoczny dla zalogowanych], substituting the data into the case can get the best aging time to 9.014h. Ripening time can be taken 9h, designed for the aging time 4h, can be calculated as the difference between the two costs: a Krcat1t-K ��cat1tY ~ 105 (tl-t2) +13900 x3.396 (e eleven e) tl- -4, t2 = 9 ʱ, y = 3321 Ԫ ripening time is 9h, the cost of 3321 yuan per tank savings. That the cost per ton of product may be reduced by 110 yuan or so. Improve the aging temperature, reduce the curing time and improve the conversion rate can also reduce costs. But raising the temperature also increased the monomer chain transfer rate, making lower-quality product, under normal circumstances should not be easily used. Manufacture the finished product can get the best ripening time, by calculating the reaction at the end of that most of = 1.9, using the formula was the best solution aging time 8.1h, taking approximately 8h, and the original design for 4h. According to equation solve for yz = 1590 yuan, 53 yuan per ton savings. Intermediate manufacturing cost savings combine ton polyether polyols using the best ripening time can save costs 89.7 yuan. Intermediates can be produced per ton of finished 3t. 4 Conclusion The production of polyether polyols obtained Kinetics of fed-type polyether production of dynamic mathematical model,[link widoczny dla zalogowanych], based on the dynamic mathematical model to calculate the value of the response phase, and production compared to measured values. Error is small, then get the best value of the ripening time, ripening time using the best production of polyether aging time than the original design to reduce costs 89.7 yuan / t product, has significant economic benefits.
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