Author Topic: hydroquinone----->p-benzoquinone with Q's  (Read 119 times)

jkl

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hydroquinone----->p-benzoquinone with Q's
« on: December 05, 2011, 04:06:17 AM »
Ok so after much searching swim thinks that this is best done by 35% peroxide and I2?

http://www.erowid.org/archive/rhodium/chemistry/benzoquinone.html

From Hydroquinone using hydrogen peroxide [4]

55 g of hydroquinone, 115 g of isopropyl alcohol as a reaction medium, and 1 g of iodine as a catalyst were charged into a 300 ml four-necked glass reaction vessel with a stirrer, a dropping funnel, and a thermometer. Then stirring was started, and after 58 g of a 35% hydrogen peroxide solution were added over about 3 hours while keeping the temperature at 30-35°C, the temperature was raised to about 45°C, which was kept for about 3 hours to complete the reaction. After the completion of the reaction, the reaction mixture was cooled gradually to about 15°C, and the reaction product was filtered by suction. The reaction product was washed with a small amount of isopropyl alcohol, and dried under reduced pressure to yield 49.5 g of p-benzoquinone. The yield was 91.6% (based on the charged hydroquinone, hereinafter the same being applied), the melting point was 111-112°C, and the purity as measured by HPLC was 99.0%.

The filtered mother liquor containing isopropyl alcohol that had been obtained by filtering the reaction product by suction was distilled under normal pressures or reduced pressure in a usual manner to recover aqueous isopropyl alcohol containing about 12% of water. The recovered isopropyl alcohol can be used again as a reaction medium in the next reaction.


So after more research swim found that 35 % peroxide can be had really easy. ( dont ask Mom use to use it) so after looking  at the grades swim found this...
http://www.h2o2-4u.com/grades.html

saying:  30-35% Technical Grade Hydrogen Peroxide   
Used for waste water treatment and the disinfection of potable water, cosmetics, and laundry applications.  [...*...additional information removed for FDA compliance] [May contain a small amount of phosphorus to neutralize any chlorine in the water it is combined with.]
and then it goes on to say:
Technical 35% - essentially free of inorganic metals suitable for chemical synthesis.

]So in other reactions it says to use right away? Is this something swim should worry about? or could swim store it???
Also when swim use to see it from a place it was GREEN but everything says it should be yellow, WHY is this..


So after we bees talk this over and find whats best this will be scaled up and followed by pictures in a dream later to be dreamed.

NeilPatrickHarris

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Re: hydroquinone----->p-benzoquinone with Q's
« Reply #1 on: December 05, 2011, 03:32:57 PM »
h2o2/water solutions shouldn't be green or yellow it should be clear.  for storage, h2o2 is best stored in a proper air-tight container in the refrigerator.  a density test will determine the concentration but make sure what you have is a pure h2o2/water solution first.  a density test won't do any good if there are other compounds/additives/impurities present, their weight will throw everything off and render the density test inaccurate.

jkl

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Re: hydroquinone----->p-benzoquinone with Q's
« Reply #2 on: December 05, 2011, 05:42:03 PM »
swim sorry he meant that the P-BQ was green that he saw last from a photo supplier!

then why is the H2o2 that is found in beauty supply place just on the shelf?

Also is there a way to test for the purity's of you H2o2

Dr. Tox

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Re: hydroquinone----->p-benzoquinone with Q's
« Reply #3 on: December 06, 2011, 09:31:21 PM »
p-benz was never hard to obtain for yours truly. 5Lb buckets and as I recall it was reddish/rusty colored.
Alimentary, dear Watson; I had a gut feeling.

salat

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Re: hydroquinone----->p-benzoquinone with Q's
« Reply #4 on: December 07, 2011, 02:30:23 PM »
You can get a guaranteed concentration of hydrogen peroxide by making Urea Hydrogen Peroxide out of it - easier to store as well.

Salat
Salat