Hydrocarbon conversion with crystalline zeolite ZSM-34

A process for polymerizing a hydrocarbon charge containing olefinic or acetylenic carbon-to-carbon linkage, which comprises contacting said hydrocarbon charge under polymerization conditions with a catalyst comprising a zeolite or thermal decomposition product thereof, which zeolite has a composition, as synthesized and in anhydrous form, in terms of mole ratios of oxides as follows:

• (0.5-1.3)R.sub.2 O :
• (0-0.15 Na.sub.2 O) :
• (0.10-0.50)K.sub.2 O :
• Al.sub.2 O.sub.3 :
• X SiO.sub.2
• where R is the organic nitrogen-containing cation derived from choline and X is 8 to 50, said zeolite being characterized by:
• (1) an X-ray diffraction pattern set forth in Table 1 of the specification;
• and
• (2) the capability, after calcination at 1000.degree. F for at least a time to remove the organic cation, of sorbing at least 9.5 weight percent of n-hexane at ambient temperature and a n-hexane pressure of 20 mm.

A process for cracking a hydrocarbon charge which comprises contacting said hydrocarbon charge, under cracking conditions, with a catalyst comprising a zeolite or thermal decomposition product thereof, which zeolite has a composition, as synthesized and in anhydrous form, in terms of mole ratios of oxides as follows:

• (0.5-1.3)R.sub.2 O :
• (0-0.15 Na.sub.2 O) :
• (0.10-0.50)K.sub.2 O :
• Al.sub.2 O.sub.3 :
• X SiO.sub.2
• wherein R is the organic nitrogen-containing cation derived from choline and X is 8 to 50, said zeolite being characterized by:
• (1) an X-ray diffraction pattern set forth in Table 1 of the specification;
• and
• (2) the capability, after calcination at 1000.degree. F for at least a time to remove the organic cation, of sorbing at least 9.5 weight percent of n-hexane at ambient temperature and a n-hexane pressure of 20 mm.