The First Minister has called for a "truce deal" so that production can resume as normal at the Grangemouth oil refinery while negotiations between union chiefs and the owners of the plant take place.

Alex Salmond has urged Unite to confirm in writing that they will commit to normal working at the plant without industrial action to December 31 and has called on Ineos to fire up the plant and restart production while further negotiations and consultations regarding the future of the plant may take place.

"It's a truce deal to get the plant up and running," the First Minister said.

"It's not for me to tell Unite or the company or the workforce how they should negotiate or consult on their terms and conditions, that's for them to do, but I want these negotiations to take place against the background of a plant that is operating as opposed to that is cold."

He added: "From my discussions (on Thursday) night with both parties in this dispute I believe both are sincerely committed to create a great future for Grangemouth.

"I believe that whilst there will be a long way to go, I believe that acceptance of my proposal tonight would be an essential first step in this process."

The First Minister announced he would host the talks as he addressed SNP activists at the start of the party conference, saying that the Grangemouth dispute is a "difficult industrial situation" and he is disappointed that talks at the conciliation service Acas failed to resolve it.

Grangemouth owners Ineos said it is keeping the plant shut while workers are consulted about proposed changes to issues such as pensions.

The dispute over the treatment of union convener Stephen Deans has cost Ineos £20 million at a time when the refinery is losing £10 million a month, according to the company.

Workers have now been given details of Ineos's survival plan, with the firm saying it is D-Day for the oil refinery site.

Unite, which called off a 48-hour strike planned for Sunday, accused Ineos of ''fancy accounting manoeuvres'' and challenged the firm's claims about the financial difficulty it faces.

Mr Salmond said contingency plans to cover the period when the plant is shut are "well laid to ensure the flow of petrol and fuel continues and the Scottish economy continues to function".

Letters have been sent to the homes of Grangemouth workers detailing changes to their terms and conditions, including ending their final salary pension scheme, freezing pay and bonuses, reducing shift allowances and new agreements with unions including having part-time conveners.

The letter said: "We expect to seek individual employee agreement to the final changes, and, where agreement is not forthcoming, to implement the changes in due course by issuing notices of termination and offering new contracts of employment to those employees which incorporate the new terms."

Unite said staff have been told to accept the new terms and conditions by 6pm on Monday, which amounts to a "sign or be sacked" ultimatum, and that it is considering legal action.

Ineos said it is going directly to the employees rather than deal with their union, amid fresh clashes over the company's finances and its decision to close the plant.

The Grangemouth refining and chemicals complex has been shut down twice in the last 40 years - during a previous strike in 2008 and again in preparation for the latest walkout, according to Ineos.

It said it is unable to restart the complex on safety grounds.

Pat Rafferty, Unite Scottish secretary, said: "The First Minister's involvement underlines Grangemouth's importance to the Scottish economy.

"We hope his intervention assists us in reaching a settlement that secures the future of such a vital national asset.

"Going forward the company needs to lift the fear of it's 'sign or be sacked' ultimatum which is hanging over the workforce and negotiate a transitional plan for the site."