3results about How to "Reduce cracking rate" patented technology

The application discloses a kind of self-adaptive cutting processes for preventing silicon rod hidden crack, including the following steps: silicon rod pretreatment, cutting equipment debugging and initialization, multidimensional real-time monitoring, parameter adaptive adjustment, cutting process closed-loop control, cutting completion and post-processing.The application detects the whole dimension through the silicon rod pretreatment stage, multidimensional real-time monitoring the key parameters such as internal stress and cutting line state of silicon rod, dynamically adjusts the cutting parameters through adaptive algorithm, realizes the accurate control of cutting stress, avoids the hidden crack caused by excessive stress and parameter mismatch from the root;According to the differences of silicon rod characteristics, the state changes in the cutting process, automatically adjust the cutting parameters, with strong adaptive ability, wide adaptability, improve the cutting efficiency and silicon rod cutting yield;Through the filing of cutting data and the construction of database, realize the continuous optimization of process, with high degree of automation, reduce labor cost.

The invention provides a ZSM-23 molecular sieve, a preparation method thereof and a catalyst. The preparation method comprises the following steps: mixing a silicon source, an aluminum source, an alkali source, an organic structure-directing agent, a mesoporous template agent, a crystal growth inhibitor and water to form a raw material solution, crystallizing, washing, drying and roasting to obtain the ZSM-23 molecular sieve, the crystal growth inhibitor comprises one or a combination of more than two of trimethoxy [3-(phenylamino) propyl] silane, lauryl sodium sulfate, tetradecyl phosphoric acid and glutamic acid. According to the method, the ZSM-23 molecular sieve with small crystal grains and a hierarchical pore structure can be synthesized in one step, and the catalytic performance of the molecular sieve is improved.

This invention provides a method for producing lubricating oil base oil from heavy feedstock and the resulting lubricating oil base oil. The method includes: cutting the heavy feedstock to obtain a light component, a middle fraction, and a bottom wax; wherein the boiling point ranges of the light component, the middle fraction, and the bottom wax are 170-300℃, 300-500℃, and >500℃, respectively; subjecting the bottom wax to a first isomerization reaction under the catalysis of a first isomerization catalyst to obtain a first isomerization product; subjecting the first isomerization product and the middle fraction to a second isomerization reaction under the catalysis of a second isomerization catalyst to obtain a second isomerization product; subjecting the second isomerization product to hydrorefining; and then fractionating the obtained refined product to obtain the lubricating oil base oil. The lubricating oil base oil produced by this method has high yield, low pour point, low cloud point, and high viscosity index, making it a high-quality lubricating oil base oil.