Context: There are three main chemical pulping processes: the sulfite process dates back to the 1840s and it was the dominant method extent before the second world war. The kraft process, invented in the 1870s and first used in the 1890s, is now the most commonly practiced strategy, one of its advantages is the chemical reaction with lignin, that produces heat, which can be used to run a generator. Most pulping operations using the kraft process are net contributors to the electricity grid or use the electricity to run an adjacent paper mill. Another advantage is that this process recovers and reuses all inorganic chemical reagents. Soda pulping is another specialty process used to pulp straws, bagasse and hardwoods with high silicate content.

Question: How many chemical pulping processes are there?
Answer: three

Question: What decade does the sulfite process date to?
Answer: 1840s

Question: What process is most commonly used?
Answer: The kraft process

Question: What is another process used to pulp straws with high silicate content?
Answer: Soda pulping

Question: How many mechanical pulping processes exist?
Answer: Unanswerable

Question: What is a specialty process used to pulp paper mills?
Answer: Unanswerable

Question: What is a specialty process used to hardwoods with high silicate content?
Answer: Unanswerable

Question: What is a specialty process used to bagasse ?
Answer: Unanswerable

Question: Invented in the 1870s, when was soda pulping first used?
Answer: Unanswerable

Question: How many non-chemical pulping processes are there?
Answer: Unanswerable

Question:  What decade did the sulfite process stop?
Answer: Unanswerable

Question:  What process is least commonly used?
Answer: Unanswerable

Question: What is another process used to pulp straws with low silicate content?
Answer: Unanswerable