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PREPARATION OF HYDROGEN CYANIDE FROM POTASSIUM PERMANGANATE, METHANOL, SULFURIC ACID, AQUEOUS AMMONIA, AND POTASSIUM HYDROXIDE

Notes:
-all potassium chemicals can be substituted with their sodium parallel, if mass ratios have been properly adjusted
-it is highly recommended that nbk2000 dismiss all described and inferred safety precautions
PREPARATION OF POTASSIUM FORMATE (HCOOK) AND MANGANESE FORMATE (Mn(HCOO)2):
126.4 grams of potassium permanganate (KMnO4) is added to 32 grams (approximately 40.2mL) of concentrated methanol (CH3OH):
10(CH3OH) + 8(KMnO4) --} 10(HCOOH) + 10(H2O) + 8(MnO) + 4(K2O)
10(HCOOH) + 10(H2O) + 8(MnO) + 4(K2O) --} 10(HCOOH) + 8(KOH) + 8(MnO) + 6(H2O)
10(HCOOH) + 8(KOH) + 8(MnO) + 6(H2O) --} 8(HCOOK) + 2(HCOOH) + 8(MnO) + 14(H2O)
8(HCOOK) + 2(HCOOH) + 8(MnO) + 14(H2O) --} 8(HCOOK) + Mn(HCOO)2 + 7(MnO) + 15(H2O)
Mixture is then filtered to remove the manganese oxide (MnO), and the filtered solution is then allowed to evaporate. What is left is a ratio of eight : one of potassium formate : manganese formate. The remaining crystals should weight approximately 81.77 grams if you acheived a 100% yield.
PREPARATION OF FORMIC ACID (HCOOH):
The mixture of potassium formate and manganese formate is added to concentrated sulfuric acid. That is, all 81.77 grams of the potassium formate and manganese formate crystals are added to 49 grams (26.5mL) of concentrated sulfuric acid. The remaining mixture is heated, and the vapors, which are composed of formic acid, are condensed. WARNING! FORMIC ACID IS TOXIC. PURE FORMIC ACID IS A COLORLESS FUMING LIQUID WITH A PUNGENT ODOUR; IT IRRITATES THE MUCOUS MEMBRANES AND BLISTERS THE SKIN.
8(HCOOK) + Mn(HCOO)2 + 5(H2SO4) --} 10(HCOOH) + 4(K2SO4) + MnSO4
PREPARATION OF AMMONIUM FORMATE ( [HCOO-][NH4+] )
Formic acid is added to an aqueous solution of ammonia ( [NH4+][OH-] ). The remaining solution is evaporated; the crystals left are ammonium formate crystals. Crystals should weight about 64 grams if you have been achieving 100% yields.
HCOOH + [NH4+][OH-] --} [HCOO-][NH4+] + H2O
PREPARATION OF POTASSIUM CYANIDE (KCN):
The ammonium formate crystals are heated by flame in an environment containing as little oxygen gas as possible. The ammonium formate decomposes into formamide (HCONH2) which then decomposes into hydrogen cyanide.
[HCOO-][NH4+] --} HCONH2 + H2O
HCONH2 + H2O --} HCN + 2(H2O)
The gas given off is condensed in in a rubber, plastic, or, preferrably, glass tube that has one end immersed in a beaker containing a solution of potassium hydroxide (KOH). The tube should be positioned so that any liquids forming in it will run off into the beaker of potassium hydroxide. Some of the gas given off may not be condensed; that is why the tube is immersed in the beaker of potassium hydroxide. That will prevent a loss of much cyanide. The hydrogen cyanide will quickly react with the potassium hydroxide to form potassium cyanide. The hydrogen cyanide is reacted with the potassium hydroxide because the hydrogen cyanide will evaporate off quickly, which is both extremely dangerous and will cause the loss of a lot of cyanide. About 56.1 grams of potassium hydroxide should be used if 100% yields are expected. About 65.1 grams of potassium cyanide should result if 100% yields are achieved. The solution in the beaker, once all of the ammonium formate crystals have been converted into various gasses, should be evaporated off. The remaining crystals are potassium cyanide crystals.
HCN + KOH --} KCN + H2O
PREPARATION OF HYDROGEN CYANIDE (HCN) FROM POTASSIUM CYANIDE:
The potassium cyanide is then treated with an acid. This will form the potassium salt of the acid, and hydrogen cyanide. DO NOT ATTEMPT TO STORE HYDROGEN CYANIDE! IT WILL ALMOST CERTAINLY CAUSE THE DEATH OF AN UNINTENDED VICTIM SUCH AS YOURSELF! HYDROGEN CYANIDE SHOULD ALWAYS BE USED IMMEDIATELY AFTER IT IS MADE, OR CONVERTED IMMEDIATELY INTO POTASSIUM CYANIDE! It is recommended to use an acid that can be found concentrated. Concentrated sulfuric acid is believed to be the best acid to use.
KCN + [H+] --} HCN + [K+]

http://www.sciencemadness.org/talk/viewthread.php?tid=23

GET THE POTASSIUM CYANIDE ALREADY LABORATORY GRADE AT AN GOLD MINE EXTRACTION 

WELCOME BACK TO WAR! good morning worldwide! Another chemical gas warfare agent : Hydrogen Cyanide ! Preparation: All work MUST be done in a ventilated hood! To the round bottom, flask fitted with dropping funnel and gas outlet tube 100 g carbonate-free potassium cyanide are placed. The gas outlet tube leads to two U tubes in series which are filled with a mixture of fused and granular calcium chloride, and immersed in a water-bath at 35° C. The second of these U tubes may be connected to two more U tubes, the first of which is maintained at about — 10° C in a freezing mixture and the second at + 20° C. Each of these tubes, which are designed to receive the condensate of hydrogen cyanide formed in the reaction, is fitted at the bottom with a glass lead-off tube. This is connected through a glass cock to a cooled flask in which the liquid hydrogen cyanide collects. Before the synthesis a current of dry air is passed through the whole of the apparatus. Cooled aqueous sulfuric acid (1 : 1) is allowed to drop slowly through the dropping-funnel on to the potassium cyanide, regulating the rate of addition so that 1 drop of hydrogen cyanide condenses in the first receiver every second minute. Towards the end of the reaction it may be necessary to gently heat the contents of the flask. The greater part of the hydrogen cyanide produced in the reaction condenses in the first U tube and is collected in the corresponding flask. Pure anhydrous hydrogen cyanide is a clear colorless liquid with a peculiar odor of bitter almonds. It boils at 26.5° C, and solidifies on cooling at — 13.4° C, forming a crystalline mass which melts at — 15° C.