One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 297
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Fill-in-the-blank: In VCM produced by the acetylene method, according to the premium quality standards, the water content is ≤ μg/g, the C2H2 content is ≤ μg/g, and the C2H2Cl2 content is ≤ μg/g. Answer: 100 10 100
For VCM produced by the acetylene method, the specifications for top-grade products require water content of ≤ 80 μg/g, C2H2 content of ≤ 0.8 μg/g, and C2H2Cl2 content of ≤ 80 μg/g.
C2H2: VCM ≥ 99.95%; C2H2 content: 0.001%; high-boiling substances content: 0.01%
They should all be less than 10 ppm.
For VCM produced by the acetylene method, the specifications for top-grade products require water content of ≤250μg/g, C2H2 content of ≤0.001% μg/g, and C2H2Cl2 content of ≤10% μg/g.
For VCM produced by the acetylene method, the specifications for top-grade products require water content of ≤ 250 μg/g, C2H2 content of ≤ 10 μg/g, and C2H2Cl2 content of ≤ 2 μg/g.
We can’t figure this out; we can’t guess blindly.