Newbie seeking help: petroleum coking and petroleum asphalt

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Dear seniors, I’m not from the oil or kerosene industry, so I don’t know much about these things. The question is a bit naive; I hope everyone will kindly offer their guidance. First question: Dear seniors, regarding the formation of petroleum pitch coke, the material particles are calcined under a protective atmosphere so that they no longer stick together (it seems that a certain temperature treatment has been applied). It has a high volatile content (15%-50% by mass), a low ash content (less than 0.2% by mass), and a very low sulfur content; it is said to be less than 0.02%, but this hasn’t been confirmed through testing. It can be converted into graphite after reaching the graphitization temperature. What kind of coking is this? What kind of companies are there in the country that produce this? A friend said that there are companies in the north that produce this kind of product; I hope the seniors here can help give some advice to the juniors. Second question: Dear seniors, is petroleum asphalt or coal tar pitch isotropic? And what about the quinoline-insoluble content – should it be less than 2.5% (it seems the lower, the better)? There seem to be requirements as well regarding those toluene-insoluble substances, but I still haven’t understood what they are or what impact they have on asphalt. Lastly, the softening point should be as high as possible; 240 degrees or more would be ideal. The coking value should also be high, while the ash content and sulfur content should be very low. I wonder if the seniors here have any resources in this area that could help the juniors?