One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 304
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This post was last edited by Forever※Undaunted on 2015-9-13 at 20:43. In the process of vacuum stripping following the suspension polymerization of polyvinyl chloride, resins in which the residual amount of vinyl chloride is kept below 5 PPM are referred to as food-grade (or non-toxic) resins. If the residual amount exceeds the limit, the possible reasons are: A. Low temperature at the bottom of the stripping tower; B. High pressure at the top of the stripping tower; C. Low temperature of the feedstock; D. A temporary increase in the feed rate. Answer: ABCD
In the negative-pressure stripping process of the PVC division, resins in which the residual amount of vinyl chloride is kept below 5PPM are considered to be of food-grade (or non-toxic) quality. If the residual amount exceeds the specified limit, the possible reasons are: A. Low temperature at the bottom of the stripping tower; B. High pressure at the top of the stripping tower; C. Low temperature of the feed material; D. Sudden increase in the feed volume
In the negative-pressure stripping process of the PVC division, resins in which the residual amount of vinyl chloride is kept below 5PPM are considered to be of food-grade (or non-toxic) quality. If the residual amount exceeds the specified limit, the possible reasons are: B, high pressure at the top of the stripping tower; A, low temperature at the bottom of the stripping tower; B, high pressure at the top of the stripping tower; C, low temperature of the feed material; D, a sudden increase in the feed volume
A. Low temperature at the bottom of the stripping tower B. High pressure at the top of the stripping tower C. Low temperature of the feed flow D. Sudden increase in the feed flow rate
A. Low temperature at the bottom of the stripping tower ...............................
In the negative-pressure stripping process of the PVC division, resins in which the residual amount of vinyl chloride is kept below 5PPM are considered to be of food-grade (or non-toxic) quality. If the residual amount exceeds the specified limit, the reasons are: A
A, B, C, D,----------------------------------------------------
In the negative-pressure stripping process of the PVC division, resins in which the residual amount of vinyl chloride is kept below 5PPM are considered to be of food-grade (or non-toxic) quality. If the residual amount exceeds the specified limit, the possible reasons are: A. Low temperature at the bottom of the stripping tower; B. High pressure at the top of the stripping tower; C. Low temperature of the feed material; D. Sudden increase in the feed volume