Low-temperature carbonization of coal is characterized by the________________?
Show answer Hide answer
Answer: C. Temperature maintained is 700°C
Explanation
Low-temperature carbonization processes operate at moderate thermal levels around seven hundred degrees Celsius. Maintaining this specific temperature preserves valuable liquid tar and chemical byproducts. Industrial low-temperature coking reactors are strictly controlled near seven hundred degrees Celsius. Carbonization of coal at lower temperatures produces reactive semi-coke and rich gas. Thermal processing at moderate heat prevents the secondary cracking typical in high-temperature ovens. Process design parameters determine the exact physical and chemical properties of the products.
Chemical industries utilize low-temperature carbonization to extract valuable chemical feedstocks from coal. Semi-coke produced at these temperatures burns more easily in domestic heating applications. Controlling reactor temperatures ensures consistent product yields in specialized carbonization plants. Coke oven gas yields vary and do not strictly match that specific volumetric output value. Volatile matter in semi-coke remains above zero due to the moderate carbonization temperature. Alternative temperature options fail to represent standard low-temperature carbonization operating conditions.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What is the nutrient composition implied by a -10-5 fertilizer rating______________?
Show answer Hide answer
Answer: A. 5, 10, 5% respectively of N2, P2O5 and K2O
Fertilizer grades conventionally indicate the percentage composition of nitrogen, phosphate, and potash respectively. A standard numeric rating provides guaranteed analysis percentages for these three primary plant nutri...
Q2. How does the required number of stages respond when the reflux ratio in a continuous counter-current extraction setup is elevated_______________________?
Show answer Hide answer
Answer: B. Decrease
Increasing the reflux ratio returns more solvent back into the extraction column. This higher internal liquid traffic enriches the counter-current streams and improves separation efficiency. Consequently, fewer equilibri...
Q3. What is the reaction order depicted in the accompanying graphic, characterized by the rate expression -rA = KCA_________________?
Show answer Hide answer
Answer: D. 3
The rate expression convention and matching graphic coefficients determine reaction kinetics order. Complex chemical kinetics models evaluate the overall exponent sum in rate laws. Based on the provided rate expression p...
Q4. As ambient temperature climbs, the atomic heat capacities corresponding to all solid elemental substances_________________?
Show answer Hide answer
Answer: A. Increases
According to the Dulong-Petit law and general thermodynamic behavior, atomic heat capacities increase at high temperatures. Thermal agitation allows lattice atoms to vibrate with greater amplitudes, absorbing more therma...
Q5. How does the internal energy of a substance respond to an increase in temperature___________________?
Show answer Hide answer
Answer: A. Increases
Internal energy represents the total microscopic kinetic and potential energy stored within a given substance. Raising the temperature increases the average translational and rotational kinetic energy of its constituent...
Q6. What is the amount of work performed during the free expansion of a gas____________________?
Show answer Hide answer
Answer: B. Zero
Free expansion involves a gas rushing into an evacuated chamber against zero opposing external pressure. Mechanical work done is defined as the product of external pressure and the resulting volume change. Since external...