Catalyst Size Distribution

Question 1

Procedure

Answer 1

•if less than 100 grams of sample used to perform analysis, obtain representative sample for screening by mixing sample thoroughly and riffling catalyst sample using sample splitter

• visually inspect sieve screens, and use wire brush or air to remove particles that remain in mesh. Wipe sieves and bottom retention lab with clean rag to remove dust and fines
• weigh each of 5 sieves and pan to nearest 0.01 and record weights (designate as A)
• assemble sieve screens in order with 14 at top and 30 above bottom pan
• place sample on top (14) sieve
• open doors and too cover to shaker. Lift arm in shaker and insert sieve assembly (5 sieve screens and pan)
• place lid on 14 sieve with cork side up. Adjust height of necessary by using 3/4 inch wrench to loosen both of bottom pan supports. Support bottom pan before loosening. Verify bottom pan securely in place and won’t vibrate loose
• lower too arm, close too cover
• turn round knob to 10.00 minutes. Verify hands out of line of fire and start
• when shaker complete open doors, remove arm, lid and sieve. Separate sieves and bottom pan, weighing individually to 0.01
• enter weights into LIMS system and software will calculate

Question 2

Clean up and disposal

Answer 2

• All catalyst from sieve analysis should be disposed in black 5 gallon can designated for catalyst disposal. Return can to unit when full.
• sieves should be cleaned using air to blow out and remaining particles brushed out using wire brush and wiped with a clean cloth

Question 3

Purpose

Answer 3

Determine relative catalyst reactivity condition by sieve analysis measurement. Sample of catalyst is shaken through series of sieves and bottom pan for specified time. Weight percent of each sieve fraction calculated based on total combined weight recovered. Method designed for spherically shaped catalyst samples and samples consisting largely of catalyst fines formed from attrition