スキップしてメイン コンテンツに移動

Gap to serious quality problems

I am Chemical process engineer.

In one of the meetings of Chemical products company, my technical supervisor made a comment about the factors that caused serious quality problems for equipment damage, and I wrote it down because it was different from what I thought.


My supervisor's comment

-Change the sensitivity to quality depending on the type of product (food, semiconductor, or industrial).

-Raise the skill level of engineers.


My thoughts

-Sensitivity to quality is almost the same regardless of the type of product. For food products, be especially careful.

-Since the skill of a technician (i.e. a single person) is limited, seek the opinion of an expert.


Comments from third party

-Leave the basis of judgment for measures against abnormal phenomena so that it can be understood even if it is verified later.

-Do not arbitrarily decide the boundary with other departments among those in charge.

-Clarify the drawings of the equipment as much as possible and determine the specifications for updating.


コメント

このブログの人気の投稿

The production process of sake

 I heard that another company was making acrylamide, a chemical product , using bacteria to synthesize it (no byproducts), so out of curiosity, I went to see the production process of sake, which is made using bacteria. C 6 H 12 O 6   →                  2C 2 H 5 OH  +  2CO 2 ↑ (glucose)  bacteria                (ethanol) 1. Rice malt is grown on steamed rice to encourage  aspergillus  growth. 2.  Rice malt,  Yeast, steamed rice, and water are added to the tank in several times and maintained at low temperature (unrefined). ※ The quality of the water is most important. 3) Squeeze out the  unrefined , let the liquid stand, and filter out the supernatant liquid.

CO2 Reduction

  I will transcribe this from a chemical engineering journal*1) for my own understanding.  Let's consider the reaction of a plant that reduces CO2 to oxygen. First, a water molecule is "photo-oxidized" to produce one mole of oxygen molecules, and at the same time, two moles of "hydride" (H-) are produced, and these two moles of "hydride" reduce CO2. In short, the equation for the photo-oxidation of water is ② from ①. H- = H+ + 2e-   ① 2H2O+4hν → O2+4e- + 4H+ → O2+2H- + 2H+   ② The "conversion of photons (hν) to electron energy (e-)" in equation ① above is achieved by the catalytic function of chlorophyll in plants. Artificially, it is done by photocatalysts. The author of this article has succeeded in "CO2 reduction to methanol" *2). The principle is the reduction of CO2 by 3 moles of "hydride" ③. 3H- + CO2 + 3H+ → CH3-OH (methanol) + H2O   ③ *1)Production Engineering Journal, Chemical Equipment, April 2021, p63 *2)Y. Mats...

Photochemical industry production

 This is an excerpt from the following book*1) as a memo of what I found interesting. Oxidation and reduction can proceed simultaneously in the same reaction field (on a photocatalyst), a characteristic unique to photocatalytic reactions that cannot be realized in other reaction systems.  When L-lysine, a kind of essential amino acid, is used as a raw material for photocatalytic reactions in aqueous solution in an oxygen-free atmosphere, pipecolic acid is generated. The photocatalytic synthesis of pipecolinic acid is the only synthetic pathway known to date that does not require any special reagents and does not produce any byproducts because the reaction involves redox reactions with excited electrons and holes.   The only photochemical reaction currently used for industrial production is probably the PNC method of ε-caprolactam synthesis by photo-nitrosation, developed by Toray Industries, Inc. ε-caprolactam is the raw material for 6-nylon, which is probably synthe...